115139388 has 96 divisors (see below), whose sum is σ = 334372864. Its totient is φ = 30025728.

The previous prime is 115139377. The next prime is 115139441. The reversal of 115139388 is 883931511.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 105381 + ... + 106467.

Almost surely, 2^115139388 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 115139388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (167186432).

115139388 is an abundant number, since it is smaller than the sum of its proper divisors (219233476).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

115139388 is a wasteful number, since it uses less digits than its factorization.

115139388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1211 (or 1209 counting only the distinct ones).

The product of its digits is 25920, while the sum is 39.

The square root of 115139388 is about 10730.3023256570. The cubic root of 115139388 is about 486.4908080020.

The spelling of 115139388 in words is "one hundred fifteen million, one hundred thirty-nine thousand, three hundred eighty-eight".