391238268 has 24 divisors (see below), whose sum is σ = 914777472. Its totient is φ = 130143024.

The previous prime is 391238249. The next prime is 391238279. The reversal of 391238268 is 862832193.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27630 + ... + 39317.

It is an arithmetic number, because the mean of its divisors is an integer number (38115728).

Almost surely, 2^391238268 is an apocalyptic number.

It is an amenable number.

391238268 is an abundant number, since it is smaller than the sum of its proper divisors (523539204).

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

391238268 is a wasteful number, since it uses less digits than its factorization.

391238268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67441 (or 67439 counting only the distinct ones).

The product of its digits is 124416, while the sum is 42.

The square root of 391238268 is about 19779.7438810516. The cubic root of 391238268 is about 731.3867852526.

The spelling of 391238268 in words is "three hundred ninety-one million, two hundred thirty-eight thousand, two hundred sixty-eight".