865164239 has 6 divisors (see below), whose sum is σ = 868035456. Its totient is φ = 862302480.

The previous prime is 865164211. The next prime is 865164269. The reversal of 865164239 is 932461568.

It is a de Polignac number, because none of the positive numbers 2^k-865164239 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 865164239.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865164269) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 93554 + ... + 102384.

It is an arithmetic number, because the mean of its divisors is an integer number (144672576).

Almost surely, 2^865164239 is an apocalyptic number.

865164239 is a deficient number, since it is larger than the sum of its proper divisors (2871217).

865164239 is an frugal number, since it uses more digits than its factorization.

865164239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9457 (or 9144 counting only the distinct ones).

The product of its digits is 311040, while the sum is 44.

The square root of 865164239 is about 29413.6743539463. The cubic root of 865164239 is about 952.8682433855.

The spelling of 865164239 in words is "eight hundred sixty-five million, one hundred sixty-four thousand, two hundred thirty-nine".