115215993 has 16 divisors (see below), whose sum is σ = 178112640. Its totient is φ = 73470672.

The previous prime is 115215979. The next prime is 115216009. The reversal of 115215993 is 399512511.

115215993 is a `hidden beast` number, since 11 + 52 + 1 + 599 + 3 = 666.

It is not a de Polignac number, because 115215993 - 2⁴ = 115215977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (115215913) 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, 92146 + ... + 93387.

It is an arithmetic number, because the mean of its divisors is an integer number (11132040).

Almost surely, 2^115215993 is an apocalyptic number.

It is an amenable number.

115215993 is a deficient number, since it is larger than the sum of its proper divisors (62896647).

115215993 is a wasteful number, since it uses less digits than its factorization.

115215993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185565 (or 185559 counting only the distinct ones).

The product of its digits is 12150, while the sum is 36.

The square root of 115215993 is about 10733.8712960423. The cubic root of 115215993 is about 486.5986754226.

The spelling of 115215993 in words is "one hundred fifteen million, two hundred fifteen thousand, nine hundred ninety-three".