12990891 has 16 divisors (see below), whose sum is σ = 18321408. Its totient is φ = 8174400.

The previous prime is 12990871. The next prime is 12990899. The reversal of 12990891 is 19809921.

It is a happy number.

It is not a de Polignac number, because 12990891 - 2¹³ = 12982699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12990899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2110 + ... + 5516.

It is an arithmetic number, because the mean of its divisors is an integer number (1145088).

Almost surely, 2^12990891 is an apocalyptic number.

12990891 is a deficient number, since it is larger than the sum of its proper divisors (5330517).

12990891 is a wasteful number, since it uses less digits than its factorization.

12990891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3482.

The product of its (nonzero) digits is 11664, while the sum is 39.

The square root of 12990891 is about 3604.2878630875. The cubic root of 12990891 is about 235.0785372024.

The spelling of 12990891 in words is "twelve million, nine hundred ninety thousand, eight hundred ninety-one".