239931990 has 32 divisors (see below), whose sum is σ = 639819360. Its totient is φ = 63981792.

The previous prime is 239931977. The next prime is 239932027. The reversal of 239931990 is 99139932.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

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, 444049 + ... + 444588.

It is an arithmetic number, because the mean of its divisors is an integer number (19994355).

Almost surely, 2^239931990 is an apocalyptic number.

239931990 is an abundant number, since it is smaller than the sum of its proper divisors (399887370).

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

239931990 is a wasteful number, since it uses less digits than its factorization.

239931990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 888653 (or 888647 counting only the distinct ones).

The product of its (nonzero) digits is 118098, while the sum is 45.

The square root of 239931990 is about 15489.7382159932. The cubic root of 239931990 is about 621.3877948444.

The spelling of 239931990 in words is "two hundred thirty-nine million, nine hundred thirty-one thousand, nine hundred ninety".