Properties of the Number 40000

Forty Thousand

Basics

Value: 39999 → 40000 → 40001

Parity: even

Prime: No

Previous Prime: 39989

Next Prime: 40009

Digit Sum: 4

Digital Root: 4

Palindrome: No

Factorization: 2 ⁶ × 5 ⁴

Divisors: 1, 2, 4, 5, 8, 10, 16, 20, 25, 32

Polygonal

Triangular: No

Square: Yes

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 1001110001000000

Octal: 116100

Duodecimal: 1B194

Hexadecimal: 9c40

Square: 1600000000

Square Root: 200

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: Yes

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) is the maximal number of a's that can be produced in a blank document with n "keystrokes". A193286

Numbers whose prime factors are 2 and 5. A33846

Triangle read by rows: coefficients T(n,k) of a binomial decomposition of n as ∑_k=0..n T(n,k)*binomial(n,k). A244130

Triangle read by rows: coefficients T(n,k) of a binomial decomposition of n as Sum(k=0..n)T(n,k)*binomial(n,k). A244132

Triangle read by rows: coefficients T(n,k) of a binomial decomposition of n*(n-1) as Sum(k=0..n)T(n,k)*binomial(n,k). A244138

Perfect powers of Achilles numbers. A383394

Numbers that contain only one nonzero digit. A37124

Multiples of 4 whose digits add to 4. A63997

Numbers of form 2ⁱ*10^j, with i, j >= 0. A25612

Numbers of form 4ⁱ*10^j, with i, j >= 0. A25621