12440391 has 8 divisors (see below), whose sum is σ = 17159280. Its totient is φ = 8007552.

The previous prime is 12440381. The next prime is 12440411. The reversal of 12440391 is 19304421.

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

It is not a de Polignac number, because 12440391 - 2⁹ = 12439879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12440371) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71410 + ... + 71583.

It is an arithmetic number, because the mean of its divisors is an integer number (2144910).

Almost surely, 2^12440391 is an apocalyptic number.

12440391 is a deficient number, since it is larger than the sum of its proper divisors (4718889).

12440391 is a wasteful number, since it uses less digits than its factorization.

12440391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143025.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 12440391 is about 3527.0938462139. The cubic root of 12440391 is about 231.7099464252.

The spelling of 12440391 in words is "twelve million, four hundred forty thousand, three hundred ninety-one".