12987172 has 18 divisors (see below), whose sum is σ = 24982454. Its totient is φ = 5903040.

The previous prime is 12987151. The next prime is 12987179. The reversal of 12987172 is 27178921.

It can be written as a sum of positive squares in only one way, i.e., 8433216 + 4553956 = 2904^2 + 2134^2 .

It is not an unprimeable number, because it can be changed into a prime (12987179) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12933 + ... + 13900.

Almost surely, 2^12987172 is an apocalyptic number.

It is an amenable number.

12987172 is a deficient number, since it is larger than the sum of its proper divisors (11995282).

12987172 is a wasteful number, since it uses less digits than its factorization.

12987172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26859 (or 26846 counting only the distinct ones).

The product of its digits is 14112, while the sum is 37.

The square root of 12987172 is about 3603.7719128713. The cubic root of 12987172 is about 235.0561024949.

The spelling of 12987172 in words is "twelve million, nine hundred eighty-seven thousand, one hundred seventy-two".