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Properties of the Number 15390

Fifteen Thousand Three Hundred Ninety

Basics

Value: 15389 → 15390 → 15391

Parity: even

Prime: No

Previous Prime: 15383

Next Prime: 15391

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 × 3 4 × 5 × 19

Divisors: 1, 2, 3, 5, 6, 9, 10, 15, 18, 19

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 11110000011110

Octal: 36036

Duodecimal: 8AA6

Hexadecimal: 3c1e

Square: 236852100

Square Root: 124.056438768812

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

Numbers k such that 2·k+1, 4·k+1, 8·k+1 and 16·k+1 are primes. A124412
T(n,k)=Number of nXk 0..2 arrays avoiding the pattern z-2 z-1 z in any row, column or nw-to-se diagonal. A207317
θ series of 20-dimensional lattice Kappa20. A362880
Numbers k such that sopfr(k + sopfr(k)) = sopfr(k) + sopfr(sopfr(k)), where sopfr = A001414. A376851
Larger of semi-unitary amicable numbers pair: numbers (m, n) such that susigma(m) = susigma(n) = m + n, where susigma(n) is the sum of the semi-unitary divisors of n (A322485). A322542
The Wiener index of the ortho-polyphenyl chain with n hexagons (see the Dou et al. and the Deng references). A216108
Smallest area of triangle with integer sides and area = n times perimeter. A289155
Numbers k such that k+1, 2k+1, 3k+1, 4k+1 are all prime. A237189
Array read by antidiagonals: T(m,n) is the number of (undirected) cycles in the complete bipartite graph Km,n. A360849
Number of permutations of [n] that avoid the patterns 2-41-3, 3-14-2, 2-1-4-3, and 4-5-3-1-2. A363813