12639386 has 4 divisors (see below), whose sum is σ = 18959082. Its totient is φ = 6319692.

The previous prime is 12639379. The next prime is 12639433. The reversal of 12639386 is 68393621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12567025 + 72361 = 3545^2 + 269^2 .

It is a super-3 number, since 3×12639386³ (a number of 22 digits) contains 333 as substring.

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, 3159845 + ... + 3159848.

Almost surely, 2^12639386 is an apocalyptic number.

12639386 is a deficient number, since it is larger than the sum of its proper divisors (6319696).

12639386 is an equidigital number, since it uses as much as digits as its factorization.

12639386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6319695.

The product of its digits is 46656, while the sum is 38.

The square root of 12639386 is about 3555.1914153812. The cubic root of 12639386 is about 232.9388850377.

The spelling of 12639386 in words is "twelve million, six hundred thirty-nine thousand, three hundred eighty-six".