865000879 has 4 divisors (see below), whose sum is σ = 874720080. Its totient is φ = 855281680.

The previous prime is 865000847. The next prime is 865000889. The reversal of 865000879 is 978000568.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 865000879 - 2⁵ = 865000847 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 (865000819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4859467 + ... + 4859644.

It is an arithmetic number, because the mean of its divisors is an integer number (218680020).

Almost surely, 2^865000879 is an apocalyptic number.

865000879 is a gapful number since it is divisible by the number (89) formed by its first and last digit.

865000879 is a deficient number, since it is larger than the sum of its proper divisors (9719201).

865000879 is an equidigital number, since it uses as much as digits as its factorization.

865000879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9719200.

The product of its (nonzero) digits is 120960, while the sum is 43.

The square root of 865000879 is about 29410.8972831500. The cubic root of 865000879 is about 952.8082661975.

The spelling of 865000879 in words is "eight hundred sixty-five million, eight hundred seventy-nine", and thus it is an aban number.