12639771 has 6 divisors (see below), whose sum is σ = 18257460. Its totient is φ = 8426508.

The previous prime is 12639713. The next prime is 12639791. The reversal of 12639771 is 17793621.

It is a happy number.

12639771 is a `hidden beast` number, since 12 + 639 + 7 + 7 + 1 = 666.

12639771 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-12639771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12639701) 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, 702201 + ... + 702218.

It is an arithmetic number, because the mean of its divisors is an integer number (3042910).

Almost surely, 2^12639771 is an apocalyptic number.

12639771 is a deficient number, since it is larger than the sum of its proper divisors (5617689).

12639771 is a wasteful number, since it uses less digits than its factorization.

12639771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1404425 (or 1404422 counting only the distinct ones).

The product of its digits is 15876, while the sum is 36.

The square root of 12639771 is about 3555.2455611392. The cubic root of 12639771 is about 232.9412501463.

The spelling of 12639771 in words is "twelve million, six hundred thirty-nine thousand, seven hundred seventy-one".