12689642 has 8 divisors (see below), whose sum is σ = 21753696. Its totient is φ = 5438412.

The previous prime is 12689641. The next prime is 12689653. The reversal of 12689642 is 24698621.

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

It is a super-2 number, since 2×12689642² = 322054028176328, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12689596 and 12689605.

It is not an unprimeable number, because it can be changed into a prime (12689641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 453188 + ... + 453215.

It is an arithmetic number, because the mean of its divisors is an integer number (2719212).

Almost surely, 2^12689642 is an apocalyptic number.

12689642 is a deficient number, since it is larger than the sum of its proper divisors (9064054).

12689642 is an equidigital number, since it uses as much as digits as its factorization.

12689642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906412.

The product of its digits is 41472, while the sum is 38.

The square root of 12689642 is about 3562.2523773590. The cubic root of 12689642 is about 233.2472094853.

It can be divided in two parts, 12689 and 642, that added together give a palindrome (13331).

The spelling of 12689642 in words is "twelve million, six hundred eighty-nine thousand, six hundred forty-two".