12639806 has 16 divisors (see below), whose sum is σ = 20418480. Its totient is φ = 5846400.

The previous prime is 12639793. The next prime is 12639817. The reversal of 12639806 is 60893621.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1145 + ... + 5156.

It is an arithmetic number, because the mean of its divisors is an integer number (1276155).

Almost surely, 2^12639806 is an apocalyptic number.

12639806 is a deficient number, since it is larger than the sum of its proper divisors (7778674).

12639806 is a wasteful number, since it uses less digits than its factorization.

12639806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6379.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 12639806 is about 3555.2504834400. The cubic root of 12639806 is about 232.9414651538.

The spelling of 12639806 in words is "twelve million, six hundred thirty-nine thousand, eight hundred six".