12639026 has 4 divisors (see below), whose sum is σ = 18958542. Its totient is φ = 6319512.

The previous prime is 12639019. The next prime is 12639031. The reversal of 12639026 is 62093621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62093621 = 1747 ⋅35543.

It can be written as a sum of positive squares in only one way, i.e., 10883401 + 1755625 = 3299^2 + 1325^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12639026.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3159755 + ... + 3159758.

Almost surely, 2^12639026 is an apocalyptic number.

12639026 is a deficient number, since it is larger than the sum of its proper divisors (6319516).

12639026 is an equidigital number, since it uses as much as digits as its factorization.

12639026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6319515.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 12639026 is about 3555.1407848354. The cubic root of 12639026 is about 232.9366734642.

The spelling of 12639026 in words is "twelve million, six hundred thirty-nine thousand, twenty-six".