12890881 has 4 divisors (see below), whose sum is σ = 12992512. Its totient is φ = 12789252.

The previous prime is 12890869. The next prime is 12890887. The reversal of 12890881 is 18809821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18809821 = 79 ⋅238099.

It is a cyclic number.

It is not a de Polignac number, because 12890881 - 2⁷ = 12890753 is a prime.

It is a super-2 number, since 2×12890881² = 332349625912322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12890881.

It is not an unprimeable number, because it can be changed into a prime (12890887) 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, 50625 + ... + 50878.

It is an arithmetic number, because the mean of its divisors is an integer number (3248128).

Almost surely, 2^12890881 is an apocalyptic number.

It is an amenable number.

12890881 is a deficient number, since it is larger than the sum of its proper divisors (101631).

12890881 is a wasteful number, since it uses less digits than its factorization.

12890881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101630.

The product of its (nonzero) digits is 9216, while the sum is 37.

The square root of 12890881 is about 3590.3873050132. The cubic root of 12890881 is about 234.4737340691.

The spelling of 12890881 in words is "twelve million, eight hundred ninety thousand, eight hundred eighty-one".