115900138 has 4 divisors (see below), whose sum is σ = 173850210. Its totient is φ = 57950068.

The previous prime is 115900123. The next prime is 115900157. The reversal of 115900138 is 831009511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 831009511 = 547 ⋅1519213.

It can be written as a sum of positive squares in only one way, i.e., 112848129 + 3052009 = 10623^2 + 1747^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28975033 + ... + 28975036.

Almost surely, 2^115900138 is an apocalyptic number.

115900138 is a deficient number, since it is larger than the sum of its proper divisors (57950072).

115900138 is an equidigital number, since it uses as much as digits as its factorization.

115900138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57950071.

The product of its (nonzero) digits is 1080, while the sum is 28.

The square root of 115900138 is about 10765.6926391199. The cubic root of 115900138 is about 487.5599056779.

Adding to 115900138 its reverse (831009511), we get a palindrome (946909649).

The spelling of 115900138 in words is "one hundred fifteen million, nine hundred thousand, one hundred thirty-eight".