391948920720 has 120 divisors (see below), whose sum is σ = 1504337305536. Its totient is φ = 89588323584.

The previous prime is 391948920719. The next prime is 391948920743. The reversal of 391948920720 is 27029849193.

391948920720 is a `hidden beast` number, since 3 + 91 + 9 + 489 + 2 + 0 + 72 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38878782 + ... + 38888861.

Almost surely, 2^391948920720 is an apocalyptic number.

391948920720 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

391948920720 is an abundant number, since it is smaller than the sum of its proper divisors (1112388384816).

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

391948920720 is a wasteful number, since it uses less digits than its factorization.

391948920720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77767669 (or 77767660 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 54.

The spelling of 391948920720 in words is "three hundred ninety-one billion, nine hundred forty-eight million, nine hundred twenty thousand, seven hundred twenty".