815238873 has 6 divisors (see below), whose sum is σ = 1177567274. Its totient is φ = 543492576.

The previous prime is 815238847. The next prime is 815238911. The reversal of 815238873 is 378832518.

It can be written as a sum of positive squares in only one way, i.e., 802192329 + 13046544 = 28323^2 + 3612^2 .

It is not a de Polignac number, because 815238873 - 2⁸ = 815238617 is a prime.

It is a super-3 number, since 3×815238873³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (815238803) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45291040 + ... + 45291057.

Almost surely, 2^815238873 is an apocalyptic number.

It is an amenable number.

815238873 is a deficient number, since it is larger than the sum of its proper divisors (362328401).

815238873 is a wasteful number, since it uses less digits than its factorization.

815238873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90582103 (or 90582100 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 815238873 is about 28552.3882188513. The cubic root of 815238873 is about 934.1751131695.

The spelling of 815238873 in words is "eight hundred fifteen million, two hundred thirty-eight thousand, eight hundred seventy-three".