12491668 has 72 divisors (see below), whose sum is σ = 28268352. Its totient is φ = 4790016.

The previous prime is 12491627. The next prime is 12491693. The reversal of 12491668 is 86619421.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76555 + ... + 76717.

It is an arithmetic number, because the mean of its divisors is an integer number (392616).

Almost surely, 2^12491668 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12491668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14134176).

12491668 is an abundant number, since it is smaller than the sum of its proper divisors (15776684).

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

12491668 is a wasteful number, since it uses less digits than its factorization.

12491668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221 (or 212 counting only the distinct ones).

The product of its digits is 20736, while the sum is 37.

The square root of 12491668 is about 3534.3553867714. The cubic root of 12491668 is about 232.0278652618.

The spelling of 12491668 in words is "twelve million, four hundred ninety-one thousand, six hundred sixty-eight".