12393891 has 20 divisors (see below), whose sum is σ = 18870192. Its totient is φ = 8103888.

The previous prime is 12393889. The next prime is 12393923. The reversal of 12393891 is 19839321.

It is not a de Polignac number, because 12393891 - 2¹ = 12393889 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12393851) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2850 + ... + 5736.

Almost surely, 2^12393891 is an apocalyptic number.

12393891 is a deficient number, since it is larger than the sum of its proper divisors (6476301).

12393891 is an equidigital number, since it uses as much as digits as its factorization.

12393891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2952 (or 2943 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 12393891 is about 3520.4958457581. The cubic root of 12393891 is about 231.4208889278.

The spelling of 12393891 in words is "twelve million, three hundred ninety-three thousand, eight hundred ninety-one".