815297223 has 16 divisors (see below), whose sum is σ = 1190528640. Its totient is φ = 493216224.

The previous prime is 815297209. The next prime is 815297281. The reversal of 815297223 is 322792518.

It is not a de Polignac number, because 815297223 - 2¹⁷ = 815166151 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (815297723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174861 + ... + 179462.

It is an arithmetic number, because the mean of its divisors is an integer number (74408040).

Almost surely, 2^815297223 is an apocalyptic number.

815297223 is a deficient number, since it is larger than the sum of its proper divisors (375231417).

815297223 is a wasteful number, since it uses less digits than its factorization.

815297223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354398.

The product of its digits is 60480, while the sum is 39.

The square root of 815297223 is about 28553.4100065124. The cubic root of 815297223 is about 934.1974002232.

The spelling of 815297223 in words is "eight hundred fifteen million, two hundred ninety-seven thousand, two hundred twenty-three".