15376
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 22
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 15
- Divisor Sum
- 30783
- Proper Divisor Sum (Aliquot Sum)
- 15407
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- yes
Derived Values
- Euler's Totient
- 7440
- Möbius Function
- 0
- Radical
- 62
- Omega Function (Ω)
- 6
- 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
- yes
- 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
- 53
- 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
- yes
- Achilles Number
- no
- Perfect Power
- yes
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- yes
- Odd
- no
Appears in sequences
- Pentagonal pyramidal numbers: a(n) = n^2*(n+1)/2.at n=31A002411
- Even pentagonal pyramidal numbers.at n=23A015224
- a(n) = (3*n+1)^2.at n=41A016778
- a(n) = (4*n)^2.at n=31A016802
- a(n) = (5*n + 4)^2.at n=24A016898
- a(n) = (6*n + 4)^2.at n=20A016958
- a(n) = (7*n + 5)^2.at n=17A017042
- a(n) = (8*n + 4)^2.at n=15A017114
- a(n) = (9*n + 7)^2.at n=13A017246
- a(n) = (10*n + 4)^2.at n=12A017318
- a(n) = (11*n + 3)^2.at n=11A017426
- a(n) = (12*n + 4)^2.at n=10A017570
- Number of nonisomorphic groupoids with no idempotents and a nontrivial symmetry.at n=4A030252
- Numbers with 15 divisors.at n=17A030633
- Decimal part of a(n)^(1/5) starts with a 'nine digits' anagram.at n=4A034280
- Triangle: T(n,k), k<=n: groupoids with a nontrivial symmetry with n elements and k idempotents.at n=10A038020
- Least k for which the integers Floor(k/m^2) for m=1,2,...,n are distinct.at n=35A054062
- Denominator of 1/16 - 1/n^2.at n=27A061042
- Squares with digital root 4.at n=27A061100
- a(1) = 1; a(n) is smallest square > a(n-1) such that a(n) + a(n-1) is a prime.at n=21A062067