15212172 has 12 divisors (see below), whose sum is σ = 35495096. Its totient is φ = 5070720.

The previous prime is 15212167. The next prime is 15212191. The reversal of 15212172 is 27121251.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 633829 + ... + 633852.

Almost surely, 2^15212172 is an apocalyptic number.

15212172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

15212172 is an abundant number, since it is smaller than the sum of its proper divisors (20282924).

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

15212172 is a wasteful number, since it uses less digits than its factorization.

15212172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1267688 (or 1267686 counting only the distinct ones).

The product of its digits is 280, while the sum is 21.

The square root of 15212172 is about 3900.2784515980. The cubic root of 15212172 is about 247.7785701291.

The spelling of 15212172 in words is "fifteen million, two hundred twelve thousand, one hundred seventy-two".