13787172 has 60 divisors (see below), whose sum is σ = 41198080. Its totient is φ = 3938544.

The previous prime is 13787171. The next prime is 13787177. The reversal of 13787172 is 27178731.

It is a happy number.

It is a super-2 number, since 2×13787172² = 380172223515168, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13787171) 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, 772 + ... + 5307.

Almost surely, 2^13787172 is an apocalyptic number.

13787172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13787172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20599040).

13787172 is an abundant number, since it is smaller than the sum of its proper divisors (27410908).

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

13787172 is a wasteful number, since it uses less digits than its factorization.

13787172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6102 (or 6091 counting only the distinct ones).

The product of its digits is 16464, while the sum is 36.

The square root of 13787172 is about 3713.1081320102. The cubic root of 13787172 is about 239.7866854600.

The spelling of 13787172 in words is "thirteen million, seven hundred eighty-seven thousand, one hundred seventy-two".