12689637 has 8 divisors (see below), whose sum is σ = 17094336. Its totient is φ = 8372352.

The previous prime is 12689627. The next prime is 12689639. The reversal of 12689637 is 73698621.

It is a happy number.

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

It is not a de Polignac number, because 12689637 - 2⁸ = 12689381 is a prime.

It is a super-2 number, since 2×12689637² = 322053774383538, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12689639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21513 + ... + 22094.

It is an arithmetic number, because the mean of its divisors is an integer number (2136792).

Almost surely, 2^12689637 is an apocalyptic number.

It is an amenable number.

12689637 is a deficient number, since it is larger than the sum of its proper divisors (4404699).

12689637 is an equidigital number, since it uses as much as digits as its factorization.

12689637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43707.

The product of its digits is 108864, while the sum is 42.

The square root of 12689637 is about 3562.2516755558. The cubic root of 12689637 is about 233.2471788504.

The spelling of 12689637 in words is "twelve million, six hundred eighty-nine thousand, six hundred thirty-seven".