391921152 has 80 divisors (see below), whose sum is σ = 1193292672. Its totient is φ = 111974400.

The previous prime is 391921099. The next prime is 391921169. The reversal of 391921152 is 251129193.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7474 + ... + 28977.

Almost surely, 2^391921152 is an apocalyptic number.

391921152 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

391921152 is an abundant number, since it is smaller than the sum of its proper divisors (801371520).

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

391921152 is an equidigital number, since it uses as much as digits as its factorization.

391921152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36479 (or 36463 counting only the distinct ones).

The product of its digits is 4860, while the sum is 33.

The square root of 391921152 is about 19796.9985603879. The cubic root of 391921152 is about 731.8120691672.

The spelling of 391921152 in words is "three hundred ninety-one million, nine hundred twenty-one thousand, one hundred fifty-two".