12689406 has 16 divisors (see below), whose sum is σ = 28198800. Its totient is φ = 4229784.

The previous prime is 12689401. The next prime is 12689423. The reversal of 12689406 is 60498621.

It is a super-2 number, since 2×12689406² = 322042049265672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12689401) 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, 117441 + ... + 117548.

It is an arithmetic number, because the mean of its divisors is an integer number (1762425).

Almost surely, 2^12689406 is an apocalyptic number.

12689406 is an abundant number, since it is smaller than the sum of its proper divisors (15509394).

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

12689406 is a wasteful number, since it uses less digits than its factorization.

12689406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235000 (or 234994 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 12689406 is about 3562.2192520955. The cubic root of 12689406 is about 233.2457635111.

The spelling of 12689406 in words is "twelve million, six hundred eighty-nine thousand, four hundred six".