391307089672 has 8 divisors (see below), whose sum is σ = 733700793150. Its totient is φ = 195653544832.

The previous prime is 391307089661. The next prime is 391307089681. The reversal of 391307089672 is 276980703193.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 332682089796 + 58624999876 = 576786^2 + 242126^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24456693097 + ... + 24456693112.

Almost surely, 2^391307089672 is an apocalyptic number.

It is an amenable number.

391307089672 is a deficient number, since it is larger than the sum of its proper divisors (342393703478).

391307089672 is a wasteful number, since it uses less digits than its factorization.

391307089672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48913386215 (or 48913386211 counting only the distinct ones).

The product of its (nonzero) digits is 3429216, while the sum is 55.

The spelling of 391307089672 in words is "three hundred ninety-one billion, three hundred seven million, eighty-nine thousand, six hundred seventy-two".