391238960 has 40 divisors (see below), whose sum is σ = 1039579296. Its totient is φ = 134138880.

The previous prime is 391238917. The next prime is 391238963. The reversal of 391238960 is 69832193.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (391238963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 348761 + ... + 349880.

Almost surely, 2^391238960 is an apocalyptic number.

It is an amenable number.

391238960 is an abundant number, since it is smaller than the sum of its proper divisors (648340336).

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

391238960 is a wasteful number, since it uses less digits than its factorization.

391238960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698661 (or 698655 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 391238960 is about 19779.7613736870. The cubic root of 391238960 is about 731.3872164642.

The spelling of 391238960 in words is "three hundred ninety-one million, two hundred thirty-eight thousand, nine hundred sixty".