391944470394 has 32 divisors (see below), whose sum is σ = 830108730816. Its totient is φ = 122946871040.

The previous prime is 391944470347. The next prime is 391944470417. The reversal of 391944470394 is 493074449193.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 543529 + ... + 1038899.

It is an arithmetic number, because the mean of its divisors is an integer number (25940897838).

Almost surely, 2^391944470394 is an apocalyptic number.

391944470394 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

391944470394 is an abundant number, since it is smaller than the sum of its proper divisors (438164260422).

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

391944470394 is a wasteful number, since it uses less digits than its factorization.

391944470394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503150.

The product of its (nonzero) digits is 11757312, while the sum is 57.

The spelling of 391944470394 in words is "three hundred ninety-one billion, nine hundred forty-four million, four hundred seventy thousand, three hundred ninety-four".