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Properties of the Number 240

Two Hundred Forty

Basics

Value: 239 → 240 → 241

Parity: even

Prime: No

Previous Prime: 239

Next Prime: 241

Digit Sum: 6

Digital Root: 6

Palindrome: No

Factorization: 2 4 × 3 × 5

Divisors: 1, 2, 3, 4, 5, 6, 8, 10, 12, 15

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 11110000

Octal: 360

Duodecimal: 180

Hexadecimal: f0

Square: 57600

Square Root: 15.491933384829668

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: Yes

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) is the number of distinct reduced words of length n in the Coxeter group of "Apollonian reflections" in three dimensions. A154638
Oblong (or promic, pronic, or heteromecic) numbers: a(n) = n*(n+1). A2378
Least integer of each prime signature A124832; also products of primorial numbers A002110. A25487
Quarter-squares: a(n) = floor(n/2)*ceiling(n/2). Equivalently, a(n) = floor(n2/4). A2620
Abundant numbers (sum of divisors of m exceeds 2m). A5101
Highly composite numbers: numbers n where d(n), the number of divisors of n (A000005), increases to a record. A2182
Average of twin prime pairs. A14574
List of totally balanced sequences of 2n binary digits written in base 10. Binary expansion of each term contains n 0's and n 1's and reading from left to right (the most significant to the least significant bit), the number of 0's never exceeds the number of 1's. A14486
a(n) = prime(n) - 1. A6093
Numbers all of whose prime divisors are consecutive primes starting at 2. A55932

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