Properties of the Number 40004

Forty Thousand Four

Basics

Value: 40003 → 40004 → 40005

Parity: even

Prime: No

Previous Prime: 39989

Next Prime: 40009

Digit Sum: 8

Digital Root: 8

Palindrome: Yes

Factorization: 2 ² × 73 × 137

Divisors: 1, 2, 4, 73, 137, 146, 274, 292, 548, 10001

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

4823 Try Today's Challenge

Representations

Binary: 1001110001000100

Octal: 116104

Duodecimal: 1B198

Hexadecimal: 9c44

Square: 1600320016

Square Root: 200.0099997500125

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 whose decimal expansion contains only 0's and 4's. A169967

Numbers n with property that n is a substring of its base 5 representation. A38105

Irregular triangular array: row n lists the numbers D, each being the discriminant of the minimal polynomial of a quadratic irrational represented by a continued fraction with period an n-tuple of 1s and 2s. A246903

Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n-1) + b(n-2) + n, where a(0) = 1, a(1) = 2, b(0) = 3, and (a(n)) and (b(n)) are increasing complementary sequences. A294552

Expansion of ∏_k>=1 1/(1 - x^k * (1 - x)). A306749

Palindromes in A085934. A85935

Numbers with decimal expansion d₁, ..., d_w such that for any k in 1..w there is some m in 1..w such that d_k = d_m = abs(k - m). A336880

Beginning with 1 palindromes with prime successive differences. A88049

Numbers n such that there are (presumably) ten palindromes in the Reverse and Add! trajectory of n. A90071

Numbers k such that the k-th triangular number contains only digits {0,1,8}. A119046