Properties of the Number 40639

Forty Thousand Six Hundred Thirty-Nine

Basics

Value: 40638 → 40639 → 40640

Parity: odd

Prime: Yes

Previous Prime: 40637

Next Prime: 40693

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 40639

Divisors: 1, 40639

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1001111010111111

Octal: 117277

Duodecimal: 1B627

Hexadecimal: 9ebf

Square: 1651528321

Square Root: 201.5911704415647

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

Smaller of two consecutive primes which are anagrams of each other. A69567

List of Ormiston prime pairs. A72274

a(n) is the smallest prime q such that (r-q)/(q-p) = n, where p<q<r are consecutive primes (or 0 if no such prime exists). A179210

Primes for which the five closest primes are smaller. A75037

Prime numbers such that, in base 10, all their proper prefixes and suffixes represent composites. A254754

Primes p such that (r-p)/log(p) > 4, where r is the next prime after p. A82889

Primes p such that (r-p)/log(p) > 5, where r is the next prime after p. A82890

Middle q of three consecutive primes p,q,r, such that one adjacent prime is near, the other is far and the ratio of the differences (whichever of (r-q)/(q-p) or (q-p)/(r-q) is greater than 1) sets a record. A84105

Constant term of the reduction by x²->x+1 of the polynomial p(n,x) defined at Comments. A193046

Indices where the cumulative sum of cos(2k+1)^2k+1 reaches a record high value. A389559