12689394 has 16 divisors (see below), whose sum is σ = 25626432. Its totient is φ = 4188528.

The previous prime is 12689393. The next prime is 12689401. The reversal of 12689394 is 49398621.

It is a super-2 number, since 2×12689394² = 322041440174472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12689393) 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, 9649 + ... + 10884.

It is an arithmetic number, because the mean of its divisors is an integer number (1601652).

Almost surely, 2^12689394 is an apocalyptic number.

12689394 is an abundant number, since it is smaller than the sum of its proper divisors (12937038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12689394 is a wasteful number, since it uses less digits than its factorization.

12689394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20641.

The product of its digits is 93312, while the sum is 42.

The square root of 12689394 is about 3562.2175677519. The cubic root of 12689394 is about 233.2456899865.

It can be divided in two parts, 12 and 689394, that multiplied together give a palindrome (8272728).

The spelling of 12689394 in words is "twelve million, six hundred eighty-nine thousand, three hundred ninety-four".