12689418 has 32 divisors (see below), whose sum is σ = 29715840. Its totient is φ = 3536640.

The previous prime is 12689401. The next prime is 12689423. The reversal of 12689418 is 81498621.

It is a super-2 number, since 2×12689418² = 322042658357448, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1963 + ... + 5406.

It is an arithmetic number, because the mean of its divisors is an integer number (928620).

Almost surely, 2^12689418 is an apocalyptic number.

12689418 is an abundant number, since it is smaller than the sum of its proper divisors (17026422).

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

12689418 is a wasteful number, since it uses less digits than its factorization.

12689418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7422.

The product of its digits is 27648, while the sum is 39.

The square root of 12689418 is about 3562.2209364384. The cubic root of 12689418 is about 233.2458370356.

The spelling of 12689418 in words is "twelve million, six hundred eighty-nine thousand, four hundred eighteen".