12639231 has 12 divisors (see below), whose sum is σ = 19916520. Its totient is φ = 7660080.

The previous prime is 12639229. The next prime is 12639239. The reversal of 12639231 is 13293621.

12639231 is a `hidden beast` number, since 1 + 2 + 639 + 23 + 1 = 666.

It is not a de Polignac number, because 12639231 - 2¹ = 12639229 is a prime.

It is a super-2 number, since 2×12639231² = 319500320542722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12639195 and 12639204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12639239) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63736 + ... + 63933.

It is an arithmetic number, because the mean of its divisors is an integer number (1659710).

Almost surely, 2^12639231 is an apocalyptic number.

12639231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12639231 is a deficient number, since it is larger than the sum of its proper divisors (7277289).

12639231 is a wasteful number, since it uses less digits than its factorization.

12639231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127686 (or 127683 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 12639231 is about 3555.1696162068. The cubic root of 12639231 is about 232.9379328376.

The spelling of 12639231 in words is "twelve million, six hundred thirty-nine thousand, two hundred thirty-one".