13887972 has 54 divisors (see below), whose sum is σ = 40842438. Its totient is φ = 3967488.

The previous prime is 13887953. The next prime is 13887977. The reversal of 13887972 is 27978831.

It can be written as a sum of positive squares in only one way, i.e., 8156736 + 5731236 = 2856^2 + 2394^2 .

It is not an unprimeable number, because it can be changed into a prime (13887977) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2173 + ... + 5700.

Almost surely, 2^13887972 is an apocalyptic number.

13887972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

13887972 is an abundant number, since it is smaller than the sum of its proper divisors (26954466).

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

13887972 is a wasteful number, since it uses less digits than its factorization.

13887972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7897 (or 7885 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 13887972 is about 3726.6569469164. The cubic root of 13887972 is about 240.3696387377.

The spelling of 13887972 in words is "thirteen million, eight hundred eighty-seven thousand, nine hundred seventy-two".