869864138 has 32 divisors (see below), whose sum is σ = 1540788480. Its totient is φ = 363101760.

The previous prime is 869864129. The next prime is 869864173. The reversal of 869864138 is 831468968.

869864138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 869864138.

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, 48623 + ... + 64061.

It is an arithmetic number, because the mean of its divisors is an integer number (48149640).

Almost surely, 2^869864138 is an apocalyptic number.

869864138 is a deficient number, since it is larger than the sum of its proper divisors (670924342).

869864138 is a wasteful number, since it uses less digits than its factorization.

869864138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15662.

The product of its digits is 1990656, while the sum is 53.

The square root of 869864138 is about 29493.4592409910. The cubic root of 869864138 is about 954.5905751167.

The spelling of 869864138 in words is "eight hundred sixty-nine million, eight hundred sixty-four thousand, one hundred thirty-eight".