Properties of the Number 40390

Forty Thousand Three Hundred Ninety

Basics

Value: 40389 → 40390 → 40391

Parity: even

Prime: No

Previous Prime: 40387

Next Prime: 40423

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 2 × 5 × 7 × 577

Divisors: 1, 2, 5, 7, 10, 14, 35, 70, 577, 1154

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

4823 Try Today's Challenge

Representations

Binary: 1001110111000110

Octal: 116706

Duodecimal: 1B45A

Hexadecimal: 9dc6

Square: 1631352100

Square Root: 200.97263495311992

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 that are the sum of 4 positive 9th powers. A3393

Numbers k such that triangular numbers T(k) and T(k+1) sum to another triangular number (that is also a perfect square). A76708

Number of binary words of length n such that in every prefix and in every suffix the number of 0's and the number of 1's differ by at most two. A306293

Number of permutations of length n whose powers all avoid the pattern 132. A326762

a(n) gives smallest number requiring n iterations of the map i -> A053392(i) to reach zero. A60630

Numbers k such that the first k binary digits found in the base-10 expansion of π form a prime (when the decimal point is ignored). A65832

Exponential Riordan array (e^x,A005043(x)). A185814

Numbers n such that the sum of the triangular numbers T(n) and T(n+1) is equal to a hexagonal number H(m) for some m. A251924

Numbers k such that Bernoulli number B_k has denominator 4686. A295770

Table read by rows. T(n, k) = (-1)^{n - k} * ∑_j=k..n binomial(n, j) * A354794(j, k) * j^{n - j}. A359759