12000391 has 4 divisors (see below), whose sum is σ = 12923512. Its totient is φ = 11077272.

The previous prime is 12000383. The next prime is 12000407. The reversal of 12000391 is 19300021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12000391 - 2³ = 12000383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12000091) 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 3 ways as a sum of consecutive naturals, for example, 461541 + ... + 461566.

It is an arithmetic number, because the mean of its divisors is an integer number (3230878).

Almost surely, 2^12000391 is an apocalyptic number.

12000391 is a deficient number, since it is larger than the sum of its proper divisors (923121).

12000391 is an equidigital number, since it uses as much as digits as its factorization.

12000391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923120.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 12000391 is about 3464.1580506669. The cubic root of 12000391 is about 228.9453350574.

The spelling of 12000391 in words is "twelve million, three hundred ninety-one", and thus it is an aban number.