12399691 has 8 divisors (see below), whose sum is σ = 12998304. Its totient is φ = 11806080.

The previous prime is 12399683. The next prime is 12399697. The reversal of 12399691 is 19699321.

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 12399691 - 2³ = 12399683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12399697) 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, 4425 + ... + 6661.

It is an arithmetic number, because the mean of its divisors is an integer number (1624788).

Almost surely, 2^12399691 is an apocalyptic number.

12399691 is a deficient number, since it is larger than the sum of its proper divisors (598613).

12399691 is a wasteful number, since it uses less digits than its factorization.

12399691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2501.

The product of its digits is 26244, while the sum is 40.

The square root of 12399691 is about 3521.3194970068. The cubic root of 12399691 is about 231.4569828344.

The spelling of 12399691 in words is "twelve million, three hundred ninety-nine thousand, six hundred ninety-one".