12639412 has 6 divisors (see below), whose sum is σ = 22118978. Its totient is φ = 6319704.

The previous prime is 12639379. The next prime is 12639433. The reversal of 12639412 is 21493621.

It can be written as a sum of positive squares in only one way, i.e., 8976016 + 3663396 = 2996^2 + 1914^2 .

It is a congruent number.

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, 1579923 + ... + 1579930.

Almost surely, 2^12639412 is an apocalyptic number.

It is an amenable number.

12639412 is a deficient number, since it is larger than the sum of its proper divisors (9479566).

12639412 is a wasteful number, since it uses less digits than its factorization.

12639412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3159857 (or 3159855 counting only the distinct ones).

The product of its digits is 2592, while the sum is 28.

The square root of 12639412 is about 3555.1950720038. The cubic root of 12639412 is about 232.9390447608.

The spelling of 12639412 in words is "twelve million, six hundred thirty-nine thousand, four hundred twelve".