869139639 has 10 divisors (see below), whose sum is σ = 1298344520. Its totient is φ = 579426372.

The previous prime is 869139589. The next prime is 869139641. The reversal of 869139639 is 936931968.

It is not a de Polignac number, because 869139639 - 2⁷ = 869139511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (869139539) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 5364979 + ... + 5365140.

It is an arithmetic number, because the mean of its divisors is an integer number (129834452).

Almost surely, 2^869139639 is an apocalyptic number.

869139639 is a deficient number, since it is larger than the sum of its proper divisors (429204881).

869139639 is a wasteful number, since it uses less digits than its factorization.

869139639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10730131 (or 10730122 counting only the distinct ones).

The product of its digits is 1889568, while the sum is 54.

The square root of 869139639 is about 29481.1743151456. The cubic root of 869139639 is about 954.3254793068.

The spelling of 869139639 in words is "eight hundred sixty-nine million, one hundred thirty-nine thousand, six hundred thirty-nine".