815995 has 4 divisors (see below), whose sum is σ = 979200. Its totient is φ = 652792.

The previous prime is 815989. The next prime is 816019. The reversal of 815995 is 599518.

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 815995 - 2⁵ = 815963 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81595 + ... + 81604.

It is an arithmetic number, because the mean of its divisors is an integer number (244800).

2⁸¹⁵⁹⁹⁵ is an apocalyptic number.

815995 is a deficient number, since it is larger than the sum of its proper divisors (163205).

815995 is a wasteful number, since it uses less digits than its factorization.

815995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163204.

The product of its digits is 16200, while the sum is 37.

The square root of 815995 is about 903.3244157001. The cubic root of 815995 is about 93.4463837036.

The spelling of 815995 in words is "eight hundred fifteen thousand, nine hundred ninety-five".