239837640 has 64 divisors (see below), whose sum is σ = 822303360. Its totient is φ = 54819840.

The previous prime is 239837639. The next prime is 239837651. The reversal of 239837640 is 46738932.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 239837592 and 239837601.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141921 + ... + 143600.

It is an arithmetic number, because the mean of its divisors is an integer number (12848490).

Almost surely, 2^239837640 is an apocalyptic number.

239837640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

239837640 is an abundant number, since it is smaller than the sum of its proper divisors (582465720).

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

239837640 is a wasteful number, since it uses less digits than its factorization.

239837640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285542 (or 285538 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 42.

The square root of 239837640 is about 15486.6923518226. The cubic root of 239837640 is about 621.3063333922.

The spelling of 239837640 in words is "two hundred thirty-nine million, eight hundred thirty-seven thousand, six hundred forty".