13865172 has 12 divisors (see below), whose sum is σ = 32352096. Its totient is φ = 4621720.

The previous prime is 13865147. The next prime is 13865207. The reversal of 13865172 is 27156831.

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

It is a congruent number.

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, 577704 + ... + 577727.

It is an arithmetic number, because the mean of its divisors is an integer number (2696008).

Almost surely, 2^13865172 is an apocalyptic number.

13865172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

13865172 is an abundant number, since it is smaller than the sum of its proper divisors (18486924).

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

13865172 is a wasteful number, since it uses less digits than its factorization.

13865172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155438 (or 1155436 counting only the distinct ones).

The product of its digits is 10080, while the sum is 33.

The square root of 13865172 is about 3723.5966484033. The cubic root of 13865172 is about 240.2380277392.

The spelling of 13865172 in words is "thirteen million, eight hundred sixty-five thousand, one hundred seventy-two".