391696164 has 72 divisors (see below), whose sum is σ = 1036788480. Its totient is φ = 124451712.

The previous prime is 391696091. The next prime is 391696177. The reversal of 391696164 is 461696193.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 303232 + ... + 304520.

It is an arithmetic number, because the mean of its divisors is an integer number (14399840).

Almost surely, 2^391696164 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 391696164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (518394240).

391696164 is an abundant number, since it is smaller than the sum of its proper divisors (645092316).

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

391696164 is a wasteful number, since it uses less digits than its factorization.

391696164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1689 (or 1684 counting only the distinct ones).

The product of its digits is 209952, while the sum is 45.

The square root of 391696164 is about 19791.3153681103. The cubic root of 391696164 is about 731.6720065981.

The spelling of 391696164 in words is "three hundred ninety-one million, six hundred ninety-six thousand, one hundred sixty-four".