12689623 has 4 divisors (see below), whose sum is σ = 12999168. Its totient is φ = 12380080.

The previous prime is 12689609. The next prime is 12689627. The reversal of 12689623 is 32698621.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12689623 is a prime.

It is a super-2 number, since 2×12689623² = 322053063764258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12689627) 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, 154711 + ... + 154792.

It is an arithmetic number, because the mean of its divisors is an integer number (3249792).

Almost surely, 2^12689623 is an apocalyptic number.

12689623 is a deficient number, since it is larger than the sum of its proper divisors (309545).

12689623 is an equidigital number, since it uses as much as digits as its factorization.

12689623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309544.

The product of its digits is 31104, while the sum is 37.

The square root of 12689623 is about 3562.2497105060. The cubic root of 12689623 is about 233.2470930727.

The spelling of 12689623 in words is "twelve million, six hundred eighty-nine thousand, six hundred twenty-three".