115138989 has 72 divisors (see below), whose sum is σ = 207841920. Its totient is φ = 62355744.

The previous prime is 115138963. The next prime is 115138997. The reversal of 115138989 is 989831511.

It is not a de Polignac number, because 115138989 - 2¹³ = 115130797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115138999) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1056267 + ... + 1056375.

Almost surely, 2^115138989 is an apocalyptic number.

It is an amenable number.

115138989 is a deficient number, since it is larger than the sum of its proper divisors (92702931).

115138989 is an frugal number, since it uses more digits than its factorization.

115138989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163 (or 142 counting only the distinct ones).

The product of its digits is 77760, while the sum is 45.

The square root of 115138989 is about 10730.2837334341. The cubic root of 115138989 is about 486.4902460453.

It can be divided in two parts, 11513 and 8989, that added together give a palindrome (20502).

The spelling of 115138989 in words is "one hundred fifteen million, one hundred thirty-eight thousand, nine hundred eighty-nine".