869248639 has 8 divisors (see below), whose sum is σ = 1027683360. Its totient is φ = 719378016.

The previous prime is 869248631. The next prime is 869248643. The reversal of 869248639 is 936842968.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 869248639 - 2³ = 869248631 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 869248639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (869248631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2140804 + ... + 2141209.

It is an arithmetic number, because the mean of its divisors is an integer number (128460420).

Almost surely, 2^869248639 is an apocalyptic number.

869248639 is a deficient number, since it is larger than the sum of its proper divisors (158434721).

869248639 is a wasteful number, since it uses less digits than its factorization.

869248639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4282049.

The product of its digits is 4478976, while the sum is 55.

The square root of 869248639 is about 29483.0228945405. The cubic root of 869248639 is about 954.3653720638.

The spelling of 869248639 in words is "eight hundred sixty-nine million, two hundred forty-eight thousand, six hundred thirty-nine".