1539
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 10
- Divisor Sum
- 2420
- Proper Divisor Sum (Aliquot Sum)
- 881
- 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
- 972
- Möbius Function
- 0
- Radical
- 57
- Omega Function (Ω)
- 5
- Little Omega Function (ω)
- 2
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
- 34
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- Prime Power
- no
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- a(n) = n*(n+3)/2.at n=54A000096
- Number of partitions with no even part repeated; partitions of n in which no parts are multiples of 4.at n=28A001935
- Expansion of 1/((1-x)*(1-2*x)*(1-x-2*x^3)).at n=8A003230
- Number of unrooted achiral trees with n nodes.at n=23A003244
- Numbers that are the sum of 9 nonzero 8th powers.at n=6A003387
- Numbers that are the sum of 6 positive 9th powers.at n=3A003395
- Shifts one place left under 2nd-order binomial transform.at n=6A004211
- Numbers that are the sum of at most 6 positive 9th powers.at n=21A004890
- Numbers that are the sum of at most 7 positive 9th powers.at n=24A004891
- Numbers that are the sum of at most 8 positive 9th powers.at n=27A004892
- Numbers that are the sum of at most 9 positive 9th powers.at n=30A004893
- Numbers that are the sum of at most 10 positive 9th powers.at n=33A004894
- Numbers that are the sum of at most 11 positive 9th powers.at n=36A004895
- Numbers that are the sum of at most 12 positive 9th powers.at n=39A004896
- a(n) = round(n*phi^7), where phi is the golden ratio, A001622.at n=53A004942
- a(n) = ceiling(n*phi^7), where phi is the golden ratio, A001622.at n=53A004962
- Number of partitions of 3n into powers of 3.at n=53A005704
- Number of paraffins.at n=17A005997
- Numbers n such that n divides 2^n + 1.at n=9A006521
- From a partition of the integers.at n=25A006628