12399106 has 4 divisors (see below), whose sum is σ = 18598662. Its totient is φ = 6199552.

The previous prime is 12399091. The next prime is 12399109. The reversal of 12399106 is 60199321.

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

It can be written as a sum of positive squares in only one way, i.e., 6682225 + 5716881 = 2585^2 + 2391^2 .

It is not an unprimeable number, because it can be changed into a prime (12399109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3099775 + ... + 3099778.

Almost surely, 2^12399106 is an apocalyptic number.

12399106 is a deficient number, since it is larger than the sum of its proper divisors (6199556).

12399106 is an equidigital number, since it uses as much as digits as its factorization.

12399106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6199555.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 12399106 is about 3521.2364305738. The cubic root of 12399106 is about 231.4533428388.

The spelling of 12399106 in words is "twelve million, three hundred ninety-nine thousand, one hundred six".