391338372 has 24 divisors (see below), whose sum is σ = 917908992. Its totient is φ = 129762400.

The previous prime is 391338371. The next prime is 391338373. The reversal of 391338372 is 273833193.

It is an interprime number because it is at equal distance from previous prime (391338371) and next prime (391338373).

It is a super-2 number, since 2×391338372² = 306291442799220768, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 391338372.

It is not an unprimeable number, because it can be changed into a prime (391338371) 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, 83079 + ... + 87662.

It is an arithmetic number, because the mean of its divisors is an integer number (38246208).

Almost surely, 2^391338372 is an apocalyptic number.

It is an amenable number.

391338372 is an abundant number, since it is smaller than the sum of its proper divisors (526570620).

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

391338372 is a wasteful number, since it uses less digits than its factorization.

391338372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170939 (or 170937 counting only the distinct ones).

The product of its digits is 81648, while the sum is 39.

The square root of 391338372 is about 19782.2741867562. The cubic root of 391338372 is about 731.4491585813.

The spelling of 391338372 in words is "three hundred ninety-one million, three hundred thirty-eight thousand, three hundred seventy-two".