815023 has 4 divisors (see below), whose sum is σ = 889128. Its totient is φ = 740920.

The previous prime is 814991. The next prime is 815029. The reversal of 815023 is 320518.

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 815023 - 2⁵ = 814991 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 (815029) 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, 37036 + ... + 37057.

It is an arithmetic number, because the mean of its divisors is an integer number (222282).

2⁸¹⁵⁰²³ is an apocalyptic number.

815023 is a deficient number, since it is larger than the sum of its proper divisors (74105).

815023 is a wasteful number, since it uses less digits than its factorization.

815023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74104.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 815023 is about 902.7862426954. The cubic root of 815023 is about 93.4092650228.

The spelling of 815023 in words is "eight hundred fifteen thousand, twenty-three".