115530138 has 20 divisors (see below), whose sum is σ = 258873450. Its totient is φ = 38509992.

The previous prime is 115530137. The next prime is 115530139. The reversal of 115530138 is 831035511.

115530138 is a `hidden beast` number, since 115 + 530 + 13 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (115530137) and next prime (115530139).

It can be written as a sum of positive squares in only one way, i.e., 64593369 + 50936769 = 8037^2 + 7137^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (115530131) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 356413 + ... + 356736.

Almost surely, 2^115530138 is an apocalyptic number.

115530138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

115530138 is an abundant number, since it is smaller than the sum of its proper divisors (143343312).

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

115530138 is an equidigital number, since it uses as much as digits as its factorization.

115530138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713163 (or 713154 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 115530138 is about 10748.4946853036. The cubic root of 115530138 is about 487.0405232848.

Adding to 115530138 its reverse (831035511), we get a palindrome (946565649).

The spelling of 115530138 in words is "one hundred fifteen million, five hundred thirty thousand, one hundred thirty-eight".