12639874 has 16 divisors (see below), whose sum is σ = 21620088. Its totient is φ = 5490432.

The previous prime is 12639839. The next prime is 12639881. The reversal of 12639874 is 47893621.

It can be written as a sum of positive squares in 4 ways, for example, as 12552849 + 87025 = 3543^2 + 295^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13857 + ... + 14740.

Almost surely, 2^12639874 is an apocalyptic number.

12639874 is a deficient number, since it is larger than the sum of its proper divisors (8980214).

12639874 is a wasteful number, since it uses less digits than its factorization.

12639874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28629.

The product of its digits is 72576, while the sum is 40.

The square root of 12639874 is about 3555.2600467476. The cubic root of 12639874 is about 232.9418828815.

It can be divided in two parts, 126 and 39874, that added together give a square (40000 = 200²).

The spelling of 12639874 in words is "twelve million, six hundred thirty-nine thousand, eight hundred seventy-four".