391965880 has 16 divisors (see below), whose sum is σ = 881923320. Its totient is φ = 156786336.

The previous prime is 391965869. The next prime is 391965929. The reversal of 391965880 is 88569193.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4899534 + ... + 4899613.

Almost surely, 2^391965880 is an apocalyptic number.

It is an amenable number.

391965880 is an abundant number, since it is smaller than the sum of its proper divisors (489957440).

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

391965880 is a wasteful number, since it uses less digits than its factorization.

391965880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9799158 (or 9799154 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 49.

The square root of 391965880 is about 19798.1281943521. The cubic root of 391965880 is about 731.8399074581.

The spelling of 391965880 in words is "three hundred ninety-one million, nine hundred sixty-five thousand, eight hundred eighty".