239840 has 24 divisors (see below), whose sum is σ = 567000. Its totient is φ = 95872.

The previous prime is 239831. The next prime is 239843. The reversal of 239840 is 48932.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (239843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 590 + ... + 909.

It is an arithmetic number, because the mean of its divisors is an integer number (23625).

2²³⁹⁸⁴⁰ is an apocalyptic number.

239840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

239840 is an abundant number, since it is smaller than the sum of its proper divisors (327160).

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

239840 is a wasteful number, since it uses less digits than its factorization.

239840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1514 (or 1506 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 239840 is about 489.7346220148. The cubic root of 239840 is about 62.1308371268.

The spelling of 239840 in words is "two hundred thirty-nine thousand, eight hundred forty".