391883924 has 12 divisors (see below), whose sum is σ = 694478400. Its totient is φ = 193461528.

The previous prime is 391883923. The next prime is 391883957. The reversal of 391883924 is 429388193.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391883923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 619754 + ... + 620385.

It is an arithmetic number, because the mean of its divisors is an integer number (57873200).

Almost surely, 2^391883924 is an apocalyptic number.

It is an amenable number.

391883924 is a deficient number, since it is larger than the sum of its proper divisors (302594476).

391883924 is a wasteful number, since it uses less digits than its factorization.

391883924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1240222 (or 1240220 counting only the distinct ones).

The product of its digits is 373248, while the sum is 47.

The square root of 391883924 is about 19796.0582945191. The cubic root of 391883924 is about 731.7888971914.

The spelling of 391883924 in words is "three hundred ninety-one million, eight hundred eighty-three thousand, nine hundred twenty-four".