391920894 has 12 divisors (see below), whose sum is σ = 849161976. Its totient is φ = 130640292.

The previous prime is 391920887. The next prime is 391920911. The reversal of 391920894 is 498029193.

It is a congruent number.

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 in 5 ways as a sum of consecutive naturals, for example, 10886674 + ... + 10886709.

It is an arithmetic number, because the mean of its divisors is an integer number (70763498).

Almost surely, 2^391920894 is an apocalyptic number.

391920894 is an abundant number, since it is smaller than the sum of its proper divisors (457241082).

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

391920894 is a wasteful number, since it uses less digits than its factorization.

391920894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21773391 (or 21773388 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 391920894 is about 19796.9920442475. The cubic root of 391920894 is about 731.8119085842.

The spelling of 391920894 in words is "three hundred ninety-one million, nine hundred twenty thousand, eight hundred ninety-four".