11918172 has 36 divisors (see below), whose sum is σ = 32350920. Its totient is φ = 3405024.

The previous prime is 11918171. The next prime is 11918189. The reversal of 11918172 is 27181911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11918171) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9547 + ... + 10722.

Almost surely, 2^11918172 is an apocalyptic number.

11918172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

11918172 is an abundant number, since it is smaller than the sum of its proper divisors (20432748).

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

11918172 is a wasteful number, since it uses less digits than its factorization.

11918172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20290 (or 20281 counting only the distinct ones).

The product of its digits is 1008, while the sum is 30.

The square root of 11918172 is about 3452.2705571841. The cubic root of 11918172 is about 228.4212740747.

It can be divided in two parts, 11918 and 172, that added together give a triangular number (12090 = T₁₅₅).

The spelling of 11918172 in words is "eleven million, nine hundred eighteen thousand, one hundred seventy-two".