815240873 has 4 divisors (see below), whose sum is σ = 822455508. Its totient is φ = 808026240.

The previous prime is 815240863. The next prime is 815240879. The reversal of 815240873 is 378042518.

815240873 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 198612649 + 616628224 = 14093^2 + 24832^2 .

It is a cyclic number.

It is not a de Polignac number, because 815240873 - 2²² = 811046569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (815240879) 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, 3607148 + ... + 3607373.

It is an arithmetic number, because the mean of its divisors is an integer number (205613877).

Almost surely, 2^815240873 is an apocalyptic number.

It is an amenable number.

815240873 is a deficient number, since it is larger than the sum of its proper divisors (7214635).

815240873 is a wasteful number, since it uses less digits than its factorization.

815240873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7214634.

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 815240873 is about 28552.4232421698. The cubic root of 815240873 is about 934.1758770964.

The spelling of 815240873 in words is "eight hundred fifteen million, two hundred forty thousand, eight hundred seventy-three".