391555880000 has 70 divisors (see below), whose sum is σ = 970931425926. Its totient is φ = 156622336000.

The previous prime is 391555879997. The next prime is 391555880039. The reversal of 391555880000 is 88555193.

It can be written as a sum of positive squares in 5 ways, for example, as 192447161344 + 199108718656 = 438688^2 + 446216^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4854449 + ... + 4934448.

Almost surely, 2^391555880000 is an apocalyptic number.

It is an amenable number.

391555880000 is an abundant number, since it is smaller than the sum of its proper divisors (579375545926).

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

391555880000 is an frugal number, since it uses more digits than its factorization.

391555880000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9788929 (or 9788904 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 44.

The spelling of 391555880000 in words is "three hundred ninety-one billion, five hundred fifty-five million, eight hundred eighty thousand".