115172118 has 40 divisors (see below), whose sum is σ = 260663040. Its totient is φ = 38005200.

The previous prime is 115172117. The next prime is 115172119. The reversal of 115172118 is 811271511.

It is an interprime number because it is at equal distance from previous prime (115172117) and next prime (115172119).

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

It is a junction number, because it is equal to n+sod(n) for n = 115172091 and 115172100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115172117) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 12843 + ... + 19881.

It is an arithmetic number, because the mean of its divisors is an integer number (6516576).

Almost surely, 2^115172118 is an apocalyptic number.

115172118 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 115172118, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130331520).

115172118 is an abundant number, since it is smaller than the sum of its proper divisors (145490922).

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

115172118 is a wasteful number, since it uses less digits than its factorization.

115172118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7154 (or 7145 counting only the distinct ones).

The product of its digits is 560, while the sum is 27.

The square root of 115172118 is about 10731.8273374109. The cubic root of 115172118 is about 486.5369009330.

The spelling of 115172118 in words is "one hundred fifteen million, one hundred seventy-two thousand, one hundred eighteen".