1399
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 22
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 1400
- Proper Divisor Sum (Aliquot Sum)
- 1
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 1398
- Möbius Function
- -1
- Radical
- 1399
- Omega Function (Ω)
- 1
- Little Omega Function (ω)
- 1
Special
- Factorial
- no
- Catalan Number
- no
- Bell Number
- no
- Motzkin Number
- no
- Primorial
- no
Figurate Numbers
- Fibonacci Number
- no
- Triangular Number
- no
- Perfect Square
- no
- Perfect Cube
- no
- Pentagonal Number
- no
- Hexagonal Number
- no
- Lucas Number
- no
- Tetrahedral Number
- no
- Pell Number
- no
- Tribonacci Number
- no
- Pronic Number
- no
Recreational
- Happy Number
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 65
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- yes
- Composite Number
- no
- Semiprime
- no
- Squarefree Number
- yes
- Prime Power
- yes
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Prime Index
- 222
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Primes p of the form 3k+1 such that -sqrt(p) < sum_{x=1..p} cos(2*Pi*x^3/p) < sqrt(p).at n=31A000922
- Primes p such that the multiplicative order of 2 modulo p is (p-1)/6.at n=8A001136
- Numbers k such that 57*2^k + 1 is prime.at n=20A002274
- Divisible only by primes congruent to 6 mod 7.at n=40A004624
- Class 4- primes (for definition see A005109).at n=33A005112
- Primes p such that 2p-1 is also prime.at n=41A005382
- Coordination sequence T1 for Zeolite Code ATS.at n=27A008038
- Coordination sequence T1 for Zeolite Code MON.at n=23A008181
- If x and y are terms, so is x*y + 9.at n=14A009350
- Number of distinct orders of permutations of n objects; number of nonisomorphic cyclic subgroups of symmetric group S_n.at n=54A009490
- Coordination sequence T2 for Zeolite Code RTH.at n=26A009894
- Numbers in which every prefix (in base 10) is 1 or a prime.at n=44A012883
- Odd primes such that (3p+1)/2 and 3p+4 are also prime.at n=17A014223
- Primes of the form x^2 + 27y^2.at n=29A014752
- Primes p==1 (mod 6) such that 3 and -3 are both cubes (one implies other) modulo p.at n=33A014753
- Numbers k=3*m+1 such that 2^m == 1 (mod k).at n=30A016108
- Coordination sequence T8 for Zeolite Code TER.at n=25A016440
- Numbers k such that the continued fraction for sqrt(k) has period 40.at n=5A020379
- Index of 5^n within sequence of numbers of form 2^i * 5^j.at n=34A022334
- Numbers k such that k and 8*k + 5 are both prime.at n=46A023230