12897981 has 16 divisors (see below), whose sum is σ = 19165120. Its totient is φ = 8573040.

The previous prime is 12897971. The next prime is 12898007. The reversal of 12897981 is 18979821.

It is not a de Polignac number, because 12897981 - 2⁷ = 12897853 is a prime.

It is a super-2 number, since 2×12897981² = 332715827752722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12897961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14166 + ... + 15048.

It is an arithmetic number, because the mean of its divisors is an integer number (1197820).

Almost surely, 2^12897981 is an apocalyptic number.

It is an amenable number.

12897981 is a deficient number, since it is larger than the sum of its proper divisors (6267139).

12897981 is an equidigital number, since it uses as much as digits as its factorization.

12897981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1433 (or 1427 counting only the distinct ones).

The product of its digits is 72576, while the sum is 45.

The square root of 12897981 is about 3591.3759201732. The cubic root of 12897981 is about 234.5167737436.

It can be divided in two parts, 1 and 2897981, that added together give a palindrome (2897982).

The spelling of 12897981 in words is "twelve million, eight hundred ninety-seven thousand, nine hundred eighty-one".