915874397 has 6 divisors (see below), whose sum is σ = 933379578. Its totient is φ = 898377584.

The previous prime is 915874387. The next prime is 915874409. The reversal of 915874397 is 793478519.

It can be written as a sum of positive squares in 3 ways, for example, as 182223001 + 733651396 = 13499^2 + 27086^2 .

It is not a de Polignac number, because 915874397 - 2²⁴ = 899097181 is a prime.

It is a super-2 number, since 2×915874397² = 1677651822160227218, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (915874307) 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, 218243 + ... + 222399.

It is an arithmetic number, because the mean of its divisors is an integer number (155563263).

Almost surely, 2^915874397 is an apocalyptic number.

It is an amenable number.

915874397 is a deficient number, since it is larger than the sum of its proper divisors (17505181).

915874397 is an frugal number, since it uses more digits than its factorization.

915874397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8367 (or 4210 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 53.

The square root of 915874397 is about 30263.4168097391. The cubic root of 915874397 is about 971.1328377373.

Multiplying 915874397 by its sum of digits (53), we get a square (48541343041 = 220321²).

915874397 divided by its sum of digits (53) gives a square (17280649 = 4157²).

The spelling of 915874397 in words is "nine hundred fifteen million, eight hundred seventy-four thousand, three hundred ninety-seven".