12399859 has 2 divisors, whose sum is σ = 12399860. Its totient is φ = 12399858.

The previous prime is 12399857. The next prime is 12399883. The reversal of 12399859 is 95899321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12399859 - 2¹ = 12399857 is a prime.

Together with 12399857, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (12399857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6199929 + 6199930.

It is an arithmetic number, because the mean of its divisors is an integer number (6199930).

Almost surely, 2^12399859 is an apocalyptic number.

12399859 is a deficient number, since it is larger than the sum of its proper divisors (1).

12399859 is an equidigital number, since it uses as much as digits as its factorization.

12399859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 174960, while the sum is 46.

The square root of 12399859 is about 3521.3433516202. The cubic root of 12399859 is about 231.4580281453.

The spelling of 12399859 in words is "twelve million, three hundred ninety-nine thousand, eight hundred fifty-nine".