12897381 has 16 divisors (see below), whose sum is σ = 19712000. Its totient is φ = 7347888.

The previous prime is 12897361. The next prime is 12897383. The reversal of 12897381 is 18379821.

It is not a de Polignac number, because 12897381 - 2⁷ = 12897253 is a prime.

It is a super-2 number, since 2×12897381² = 332684873318322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12897383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8520 + ... + 9918.

It is an arithmetic number, because the mean of its divisors is an integer number (1232000).

Almost surely, 2^12897381 is an apocalyptic number.

It is an amenable number.

12897381 is a deficient number, since it is larger than the sum of its proper divisors (6814619).

12897381 is a wasteful number, since it uses less digits than its factorization.

12897381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1848.

The product of its digits is 24192, while the sum is 39.

The square root of 12897381 is about 3591.2923857575. The cubic root of 12897381 is about 234.5131371991.

The spelling of 12897381 in words is "twelve million, eight hundred ninety-seven thousand, three hundred eighty-one".