239640 has 32 divisors (see below), whose sum is σ = 719280. Its totient is φ = 63872.

The previous prime is 239633. The next prime is 239641. The reversal of 239640 is 46932.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 239640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (239641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 879 + ... + 1118.

2²³⁹⁶⁴⁰ is an apocalyptic number.

239640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

239640 is an abundant number, since it is smaller than the sum of its proper divisors (479640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

239640 is a wasteful number, since it uses less digits than its factorization.

239640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2011 (or 2007 counting only the distinct ones).

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

The square root of 239640 is about 489.5303872080. The cubic root of 239640 is about 62.1135622449.

The spelling of 239640 in words is "two hundred thirty-nine thousand, six hundred forty".