12340391 has 8 divisors (see below), whose sum is σ = 14229024. Its totient is φ = 10483200.

The previous prime is 12340373. The next prime is 12340403. The reversal of 12340391 is 19304321.

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

It is not a de Polignac number, because 12340391 - 2¹⁸ = 12078247 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 (12340091) 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 7 ways as a sum of consecutive naturals, for example, 7010 + ... + 8591.

It is an arithmetic number, because the mean of its divisors is an integer number (1778628).

Almost surely, 2^12340391 is an apocalyptic number.

12340391 is a deficient number, since it is larger than the sum of its proper divisors (1888633).

12340391 is a wasteful number, since it uses less digits than its factorization.

12340391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15721.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 12340391 is about 3512.8892666863. The cubic root of 12340391 is about 231.0874215442.

The spelling of 12340391 in words is "twelve million, three hundred forty thousand, three hundred ninety-one".