12312391 has 8 divisors (see below), whose sum is σ = 15153824. Its totient is φ = 9741600.

The previous prime is 12312359. The next prime is 12312397. The reversal of 12312391 is 19321321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12312391 - 2⁵ = 12312359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12312397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67560 + ... + 67741.

It is an arithmetic number, because the mean of its divisors is an integer number (1894228).

Almost surely, 2^12312391 is an apocalyptic number.

12312391 is a deficient number, since it is larger than the sum of its proper divisors (2841433).

12312391 is a wasteful number, since it uses less digits than its factorization.

12312391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135321.

The product of its digits is 324, while the sum is 22.

The square root of 12312391 is about 3508.9016800133. The cubic root of 12312391 is about 230.9125122366.

The spelling of 12312391 in words is "twelve million, three hundred twelve thousand, three hundred ninety-one".