Properties of the Number 39640

Thirty-Nine Thousand Six Hundred Forty

Basics

Value: 39639 → 39640 → 39641

Parity: even

Prime: No

Previous Prime: 39631

Next Prime: 39659

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 2 ³ × 5 × 991

Divisors: 1, 2, 4, 5, 8, 10, 20, 40, 991, 1982

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 1001101011011000

Octal: 115330

Duodecimal: 1AB34

Hexadecimal: 9ad8

Square: 1571329600

Square Root: 199.09796583591708

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

Triangle, read by rows, where the n-th row is the first n terms of the n-th self-convolution of the sequence formed by flattening this triangle. A86606

a(n) = ∑_{k=floor((n+1)/2)..n} T(k,n-k); i.e., a(n) is the n-th diagonal sum of left-justified array T given by A026998. A27010

Number of even-length integer partitions of n with integer median. A361653

Consecutive states of the linear congruential pseudo-random number generator (2661·s + 36979) mod 175000 when started at s=1. A385361

Number of (n+1) X 6 0..1 arrays with column and row pair sums b(i,j)=a(i,j)+a(i,j-1) and c(i,j)=a(i,j)+a(i-1,j) nondecreasing in column and row directions, respectively. A204648

Numbers k such that Bernoulli number B_k has denominator 13530. A295587

Cycle class sequence c(2n) (the number of true cycles of length 2n in which a certain node is included) for zeolite AFG = Afghanite (Na2,Ca,K2)12[Al24Si24O96] starting with a T2 atom. A18953

T(n,k)=Number of (n+1)X(k+1) 0..1 arrays with column and row pair sums b(i,j)=a(i,j)+a(i,j-1) and c(i,j)=a(i,j)+a(i-1,j) nondecreasing in column and row directions, respectively. A204651

Fixed point of "k -> k/2 or (k+1)/2 until result is prime", starting with prime(n)-1. A39640