12399951 has 16 divisors (see below), whose sum is σ = 17619840. Its totient is φ = 7734240.

The previous prime is 12399941. The next prime is 12399973. The reversal of 12399951 is 15999321.

It is not a de Polignac number, because 12399951 - 2⁷ = 12399823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12399901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3421 + ... + 6041.

It is an arithmetic number, because the mean of its divisors is an integer number (1101240).

Almost surely, 2^12399951 is an apocalyptic number.

12399951 is a deficient number, since it is larger than the sum of its proper divisors (5219889).

12399951 is a wasteful number, since it uses less digits than its factorization.

12399951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2726.

The product of its digits is 21870, while the sum is 39.

The square root of 12399951 is about 3521.3564147925. The cubic root of 12399951 is about 231.4586005735.

The spelling of 12399951 in words is "twelve million, three hundred ninety-nine thousand, nine hundred fifty-one".