12639922 has 4 divisors (see below), whose sum is σ = 18959886. Its totient is φ = 6319960.

The previous prime is 12639919. The next prime is 12639923. The reversal of 12639922 is 22993621.

12639922 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12595401 + 44521 = 3549^2 + 211^2 .

It is not an unprimeable number, because it can be changed into a prime (12639923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3159979 + ... + 3159982.

Almost surely, 2^12639922 is an apocalyptic number.

12639922 is a deficient number, since it is larger than the sum of its proper divisors (6319964).

12639922 is an equidigital number, since it uses as much as digits as its factorization.

12639922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6319963.

The product of its digits is 11664, while the sum is 34.

The square root of 12639922 is about 3555.2667973023. The cubic root of 12639922 is about 232.9421777472.

The spelling of 12639922 in words is "twelve million, six hundred thirty-nine thousand, nine hundred twenty-two".