12981616 has 10 divisors (see below), whose sum is σ = 25151912. Its totient is φ = 6490800.

The previous prime is 12981613. The next prime is 12981623. The reversal of 12981616 is 61618921.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12981611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405660 + ... + 405691.

Almost surely, 2^12981616 is an apocalyptic number.

12981616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12981616 is a deficient number, since it is larger than the sum of its proper divisors (12170296).

12981616 is an equidigital number, since it uses as much as digits as its factorization.

12981616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811359 (or 811353 counting only the distinct ones).

The product of its digits is 5184, while the sum is 34.

The square root of 12981616 is about 3603.0009714126. Note that the first 3 decimals coincide. The cubic root of 12981616 is about 235.0225781838.

The spelling of 12981616 in words is "twelve million, nine hundred eighty-one thousand, six hundred sixteen".