879815 has 4 divisors (see below), whose sum is σ = 1055784. Its totient is φ = 703848.

The previous prime is 879799. The next prime is 879817. The reversal of 879815 is 518978.

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 879815 - 2⁴ = 879799 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 (879817) 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, 87977 + ... + 87986.

It is an arithmetic number, because the mean of its divisors is an integer number (263946).

2⁸⁷⁹⁸¹⁵ is an apocalyptic number.

879815 is a deficient number, since it is larger than the sum of its proper divisors (175969).

879815 is a wasteful number, since it uses less digits than its factorization.

879815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175968.

The product of its digits is 20160, while the sum is 38.

The square root of 879815 is about 937.9845414504. The cubic root of 879815 is about 95.8216814231.

The spelling of 879815 in words is "eight hundred seventy-nine thousand, eight hundred fifteen".