115978257 has 16 divisors (see below), whose sum is σ = 175063680. Its totient is φ = 75859056.

The previous prime is 115978253. The next prime is 115978283. The reversal of 115978257 is 752879511.

115978257 is a `hidden beast` number, since 1 + 1 + 597 + 8 + 2 + 57 = 666.

It is not a de Polignac number, because 115978257 - 2² = 115978253 is a prime.

It is not an unprimeable number, because it can be changed into a prime (115978253) 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, 39093 + ... + 41954.

It is an arithmetic number, because the mean of its divisors is an integer number (10941480).

Almost surely, 2^115978257 is an apocalyptic number.

It is an amenable number.

115978257 is a deficient number, since it is larger than the sum of its proper divisors (59085423).

115978257 is an equidigital number, since it uses as much as digits as its factorization.

115978257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81109 (or 81103 counting only the distinct ones).

The product of its digits is 176400, while the sum is 45.

The square root of 115978257 is about 10769.3201735300. The cubic root of 115978257 is about 487.6694227698.

The spelling of 115978257 in words is "one hundred fifteen million, nine hundred seventy-eight thousand, two hundred fifty-seven".