12399665 has 8 divisors (see below), whose sum is σ = 14902080. Its totient is φ = 9904752.

The previous prime is 12399649. The next prime is 12399677. The reversal of 12399665 is 56699321.

12399665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 12399665 - 2⁴ = 12399649 is a prime.

It is a super-2 number, since 2×12399665² = 307503384224450, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2852 + ... + 5738.

It is an arithmetic number, because the mean of its divisors is an integer number (1862760).

Almost surely, 2^12399665 is an apocalyptic number.

It is an amenable number.

12399665 is a deficient number, since it is larger than the sum of its proper divisors (2502415).

12399665 is an equidigital number, since it uses as much as digits as its factorization.

12399665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3751.

The product of its digits is 87480, while the sum is 41.

The square root of 12399665 is about 3521.3158052069. The cubic root of 12399665 is about 231.4568210593.

The spelling of 12399665 in words is "twelve million, three hundred ninety-nine thousand, six hundred sixty-five".