12639621 has 8 divisors (see below), whose sum is σ = 17434080. Its totient is φ = 8135792.

The previous prime is 12639577. The next prime is 12639637. The reversal of 12639621 is 12693621.

12639621 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12639621 - 2¹³ = 12631429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12631621) 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 7 ways as a sum of consecutive naturals, for example, 72555 + ... + 72728.

It is an arithmetic number, because the mean of its divisors is an integer number (2179260).

Almost surely, 2^12639621 is an apocalyptic number.

It is an amenable number.

12639621 is a deficient number, since it is larger than the sum of its proper divisors (4794459).

12639621 is a wasteful number, since it uses less digits than its factorization.

12639621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145315.

The product of its digits is 3888, while the sum is 30.

The square root of 12639621 is about 3555.2244654874. The cubic root of 12639621 is about 232.9403286811.

The spelling of 12639621 in words is "twelve million, six hundred thirty-nine thousand, six hundred twenty-one".