12345999 has 4 divisors (see below), whose sum is σ = 16461336. Its totient is φ = 8230664.

The previous prime is 12345959. The next prime is 12346013. The reversal of 12345999 is 99954321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12345999 - 2⁸ = 12345743 is a prime.

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 12345999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12345929) 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 3 ways as a sum of consecutive naturals, for example, 2057664 + ... + 2057669.

It is an arithmetic number, because the mean of its divisors is an integer number (4115334).

Almost surely, 2^12345999 is an apocalyptic number.

12345999 is a deficient number, since it is larger than the sum of its proper divisors (4115337).

12345999 is an equidigital number, since it uses as much as digits as its factorization.

12345999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4115336.

The product of its digits is 87480, while the sum is 42.

The square root of 12345999 is about 3513.6873793780. The cubic root of 12345999 is about 231.1224215697.

The spelling of 12345999 in words is "twelve million, three hundred forty-five thousand, nine hundred ninety-nine".