240639 has 12 divisors (see below), whose sum is σ = 373464. Its totient is φ = 137424.

The previous prime is 240631. The next prime is 240641. The reversal of 240639 is 936042.

It is not a de Polignac number, because 240639 - 2³ = 240631 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 672 + ... + 965.

It is an arithmetic number, because the mean of its divisors is an integer number (31122).

2²⁴⁰⁶³⁹ is an apocalyptic number.

240639 is a deficient number, since it is larger than the sum of its proper divisors (132825).

240639 is a wasteful number, since it uses less digits than its factorization.

240639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1654 (or 1647 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 240639 is about 490.5496916725. The cubic root of 240639 is about 62.1997546197.

The spelling of 240639 in words is "two hundred forty thousand, six hundred thirty-nine".