12993891 has 16 divisors (see below), whose sum is σ = 18320640. Its totient is φ = 8169120.

The previous prime is 12993889. The next prime is 12993907. The reversal of 12993891 is 19839921.

It is not a de Polignac number, because 12993891 - 2¹ = 12993889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12993811) 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, 17361 + ... + 18093.

It is an arithmetic number, because the mean of its divisors is an integer number (1145040).

Almost surely, 2^12993891 is an apocalyptic number.

12993891 is a deficient number, since it is larger than the sum of its proper divisors (5326749).

12993891 is a wasteful number, since it uses less digits than its factorization.

12993891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1066.

The product of its digits is 34992, while the sum is 42.

The square root of 12993891 is about 3604.7040100402. The cubic root of 12993891 is about 235.0966314535.

The spelling of 12993891 in words is "twelve million, nine hundred ninety-three thousand, eight hundred ninety-one".