Properties of the Number 71440

Seventy-One Thousand Four Hundred Forty

Basics

Value: 71439 → 71440 → 71441

Parity: even

Prime: No

Previous Prime: 71437

Next Prime: 71443

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 2 ⁴ × 5 × 19 × 47

Divisors: 1, 2, 4, 5, 8, 10, 16, 19, 20, 38

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10001011100010000

Octal: 213420

Duodecimal: 35414

Hexadecimal: 11710

Square: 5103673600

Square Root: 267.28262195660983

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

Sum of the parts in the partitions of 4n into 4 parts with smallest part equal to 1 minus the number of these partitions. A239057

a(n) is the square of the n-th partial sum minus the n-th partial sum of the squares, divided by a(n-1), for all n>=1, starting with a(0)=1, a(1)=2. A87955

a(n) = ∑_i=1..n 2^φ(i), where φ=A000010. A385147

Start with 1; add the digits of the previous term and the squares of the digits of the previous term. A71440