331238138 has 48 divisors (see below), whose sum is σ = 636530400. Its totient is φ = 127824480.

The previous prime is 331238137. The next prime is 331238161. The reversal of 331238138 is 831832133.

It is not an unprimeable number, because it can be changed into a prime (331238137) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 116093 + ... + 118911.

It is an arithmetic number, because the mean of its divisors is an integer number (13261050).

Almost surely, 2^331238138 is an apocalyptic number.

331238138 is a deficient number, since it is larger than the sum of its proper divisors (305292262).

331238138 is a wasteful number, since it uses less digits than its factorization.

331238138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2955 (or 2948 counting only the distinct ones).

The product of its digits is 10368, while the sum is 32.

The square root of 331238138 is about 18199.9488460820. The cubic root of 331238138 is about 691.9054926233.

The spelling of 331238138 in words is "three hundred thirty-one million, two hundred thirty-eight thousand, one hundred thirty-eight".