391687020144 has 150 divisors (see below), whose sum is σ = 1318742760984. Its totient is φ = 111910559040.

The previous prime is 391687020139. The next prime is 391687020161. The reversal of 391687020144 is 441020786193.

It is a self number, because there is not a number n which added to its sum of digits gives 391687020144.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 3020452 + ... + 3147459.

Almost surely, 2^391687020144 is an apocalyptic number.

It is an amenable number.

391687020144 is an abundant number, since it is smaller than the sum of its proper divisors (927055740840).

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

391687020144 is a wasteful number, since it uses less digits than its factorization.

391687020144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6167945 (or 6167923 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 391687020144 in words is "three hundred ninety-one billion, six hundred eighty-seven million, twenty thousand, one hundred forty-four".