115138 has 8 divisors (see below), whose sum is σ = 180288. Its totient is φ = 55044.

The previous prime is 115133. The next prime is 115151. The reversal of 115138 is 831511.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (115133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1206 + ... + 1297.

It is an arithmetic number, because the mean of its divisors is an integer number (22536).

2¹¹⁵¹³⁸ is an apocalyptic number.

115138 is a deficient number, since it is larger than the sum of its proper divisors (65150).

115138 is a wasteful number, since it uses less digits than its factorization.

115138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2528.

The product of its digits is 120, while the sum is 19.

The square root of 115138 is about 339.3199080514. The cubic root of 115138 is about 48.6488853119.

Adding to 115138 its reverse (831511), we get a palindrome (946649).

It can be divided in two parts, 115 and 138, that added together give a triangular number (253 = T₂₂).

The spelling of 115138 in words is "one hundred fifteen thousand, one hundred thirty-eight".