238791990 has 32 divisors (see below), whose sum is σ = 574199136. Its totient is φ = 63555840.

The previous prime is 238791983. The next prime is 238792009. The reversal of 238791990 is 99197832.

It is a super-2 number, since 2×238791990² = 114043228976320200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8874 + ... + 23586.

It is an arithmetic number, because the mean of its divisors is an integer number (17943723).

Almost surely, 2^238791990 is an apocalyptic number.

238791990 is an abundant number, since it is smaller than the sum of its proper divisors (335407146).

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

238791990 is a wasteful number, since it uses less digits than its factorization.

238791990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15264.

The product of its (nonzero) digits is 244944, while the sum is 48.

The square root of 238791990 is about 15452.8958451159. The cubic root of 238791990 is about 620.4020891590.

The spelling of 238791990 in words is "two hundred thirty-eight million, seven hundred ninety-one thousand, nine hundred ninety".