12776638 has 16 divisors (see below), whose sum is σ = 22855680. Its totient is φ = 5237496.

The previous prime is 12776629. The next prime is 12776641. The reversal of 12776638 is 83667721.

It is a self number, because there is not a number n which added to its sum of digits gives 12776638.

It is a congruent number.

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, 19518 + ... + 20161.

It is an arithmetic number, because the mean of its divisors is an integer number (1428480).

Almost surely, 2^12776638 is an apocalyptic number.

12776638 is a deficient number, since it is larger than the sum of its proper divisors (10079042).

12776638 is a wasteful number, since it uses less digits than its factorization.

12776638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39711.

The product of its digits is 84672, while the sum is 40.

The square root of 12776638 is about 3574.4423341271. The cubic root of 12776638 is about 233.7790180071.

The spelling of 12776638 in words is "twelve million, seven hundred seventy-six thousand, six hundred thirty-eight".