391938960 has 80 divisors (see below), whose sum is σ = 1388589696. Its totient is φ = 89585664.

The previous prime is 391938959. The next prime is 391938997. The reversal of 391938960 is 69839193.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×391938960² = 307232296731763200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

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 15 ways as a sum of consecutive naturals, for example, 114969 + ... + 118328.

Almost surely, 2^391938960 is an apocalyptic number.

391938960 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

391938960 is an abundant number, since it is smaller than the sum of its proper divisors (996650736).

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

391938960 is a wasteful number, since it uses less digits than its factorization.

391938960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233320 (or 233314 counting only the distinct ones).

The product of its (nonzero) digits is 314928, while the sum is 48.

The square root of 391938960 is about 19797.4483204276. The cubic root of 391938960 is about 731.8231529544.

The spelling of 391938960 in words is "three hundred ninety-one million, nine hundred thirty-eight thousand, nine hundred sixty".