Properties of the Number 15856

Fifteen Thousand Eight Hundred Fifty-Six

Basics

Value: 15855 → 15856 → 15857

Parity: even

Prime: No

Previous Prime: 15823

Next Prime: 15859

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 2 ⁴ × 991

Divisors: 1, 2, 4, 8, 16, 991, 1982, 3964, 7928, 15856

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11110111110000

Octal: 36760

Duodecimal: 9214

Hexadecimal: 3df0

Square: 251412736

Square Root: 125.92060990957755

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

a(n) = n*(31·n-1)/2. A22288

Strings of 5 digits from 1...9, such that no formula using the single digits in the given order exists that evaluates to 0. A288355

Number T(n,k) of binary search trees of height k having n internal nodes; triangle T(n,k), k>=0, k<=n<=2^k-1, read by columns. A335920

Number of Twopins positions. A5686

E.g.f.: exp(x+5/2·x²). A115331

Denominators of continued fraction convergents to sqrt(436). A41831

a(n) = 512·n - 16. A157447

Positive integers congruent to 0 or 1 modulo 4 that cannot be written as x³ + y² + z² with x,y,z nonnegative integers. A275083

Number of partitions of n into parts not of the form 17k, 17k+8 or 17k-8. Also number of partitions with at most 7 parts of size 1 and differences between parts at distance 7 are greater than 1. A35969

Alternating sum of octagonal pyramidal numbers. A269429