12639557 has 4 divisors (see below), whose sum is σ = 14445216. Its totient is φ = 10833900.

The previous prime is 12639547. The next prime is 12639559. The reversal of 12639557 is 75593621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 12639557 - 2¹⁰ = 12638533 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12639557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12639559) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 902819 + ... + 902832.

It is an arithmetic number, because the mean of its divisors is an integer number (3611304).

Almost surely, 2^12639557 is an apocalyptic number.

It is an amenable number.

12639557 is a deficient number, since it is larger than the sum of its proper divisors (1805659).

12639557 is an equidigital number, since it uses as much as digits as its factorization.

12639557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1805658.

The product of its digits is 56700, while the sum is 38.

The square root of 12639557 is about 3555.2154646378. The cubic root of 12639557 is about 232.9399355204.

The spelling of 12639557 in words is "twelve million, six hundred thirty-nine thousand, five hundred fifty-seven".