12891644 has 12 divisors (see below), whose sum is σ = 23887584. Its totient is φ = 6066624.

The previous prime is 12891623. The next prime is 12891647. The reversal of 12891644 is 44619821.

It is a happy number.

It is a super-3 number, since 3×12891644³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12891647) 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, 94724 + ... + 94859.

It is an arithmetic number, because the mean of its divisors is an integer number (1990632).

Almost surely, 2^12891644 is an apocalyptic number.

It is an amenable number.

12891644 is a deficient number, since it is larger than the sum of its proper divisors (10995940).

12891644 is a wasteful number, since it uses less digits than its factorization.

12891644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189604 (or 189602 counting only the distinct ones).

The product of its digits is 13824, while the sum is 35.

The square root of 12891644 is about 3590.4935593871. The cubic root of 12891644 is about 234.4783600764.

The spelling of 12891644 in words is "twelve million, eight hundred ninety-one thousand, six hundred forty-four".