12399999 has 16 divisors (see below), whose sum is σ = 17181024. Its totient is φ = 7948800.

The previous prime is 12399991. The next prime is 12400001. The reversal of 12399999 is 99999321.

It is not a de Polignac number, because 12399999 - 2³ = 12399991 is a prime.

12399999 is a modest number, since divided by 9999 gives 1239 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12399991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8289 + ... + 9669.

It is an arithmetic number, because the mean of its divisors is an integer number (1073814).

Almost surely, 2^12399999 is an apocalyptic number.

12399999 is a deficient number, since it is larger than the sum of its proper divisors (4781025).

12399999 is a wasteful number, since it uses less digits than its factorization.

12399999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1498.

The product of its digits is 354294, while the sum is 51.

The square root of 12399999 is about 3521.3632303413. The cubic root of 12399999 is about 231.4588992306.

The spelling of 12399999 in words is "twelve million, three hundred ninety-nine thousand, nine hundred ninety-nine".