438691686 has 16 divisors (see below), whose sum is σ = 887955264. Its totient is φ = 144468584.

The previous prime is 438691663. The next prime is 438691699. The reversal of 438691686 is 686196834.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 439956 + ... + 440951.

It is an arithmetic number, because the mean of its divisors is an integer number (55497204).

Almost surely, 2^438691686 is an apocalyptic number.

438691686 is an abundant number, since it is smaller than the sum of its proper divisors (449263578).

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

438691686 is a wasteful number, since it uses less digits than its factorization.

438691686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 880995.

The product of its digits is 1492992, while the sum is 51.

The square root of 438691686 is about 20944.9680353062. The cubic root of 438691686 is about 759.8358867710.

The spelling of 438691686 in words is "four hundred thirty-eight million, six hundred ninety-one thousand, six hundred eighty-six".