Properties of the Number 40028

Forty Thousand Twenty-Eight

Basics

Value: 40027 → 40028 → 40029

Parity: even

Prime: No

Previous Prime: 40013

Next Prime: 40031

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 2 ² × 10007

Divisors: 1, 2, 4, 10007, 20014, 40028

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 1001110001011100

Octal: 116134

Duodecimal: 1B1B8

Hexadecimal: 9c5c

Square: 1602240784

Square Root: 200.06998775428562

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

a(n) = Farey(m; I) where m = Fibonacci(n + 1) and I = [1/n, 1]. A176501

Number of ways to write n as an ordered sum of 10 squarefree numbers. A341070

Positive integers j such that prime(i) + prime(j) = i·j for some i <= j. A272862

Number of compositions of 2n into n squarefree parts. A341071

E.g.f. A(x) satisfies A(x) = 1/(1 - log(1-x·A(x)²)²). A392762

Total sum of parts of multiplicity 6 in all partitions of n. A222734

Least m such that A(m) = -10ⁿ, where A(n) = σ(n) - 2n, the abundance of n. A75767

Number of walks within N³ (the first octant of Z³) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 0, 0), (0, 0, -1), (0, 1, 1), (1, 0, -1)}. A148695

Primes p such that x³ = 2 has a solution mod p. A40028