115440139 has 4 divisors (see below), whose sum is σ = 115851240. Its totient is φ = 115029040.

The previous prime is 115440119. The next prime is 115440161. The reversal of 115440139 is 931044511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 931044511 = 491 ⋅1896221.

It is a cyclic number.

It is not a de Polignac number, because 115440139 - 2⁹ = 115439627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115440119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205129 + ... + 205690.

It is an arithmetic number, because the mean of its divisors is an integer number (28962810).

Almost surely, 2^115440139 is an apocalyptic number.

115440139 is a deficient number, since it is larger than the sum of its proper divisors (411101).

115440139 is an equidigital number, since it uses as much as digits as its factorization.

115440139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411100.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 115440139 is about 10744.3072833943. The cubic root of 115440139 is about 486.9140208042.

It can be divided in two parts, 1154401 and 39, that added together give a triangular number (1154440 = T₁₅₁₉).

The spelling of 115440139 in words is "one hundred fifteen million, four hundred forty thousand, one hundred thirty-nine".