12399049 has 4 divisors (see below), whose sum is σ = 13352836. Its totient is φ = 11445264.

The previous prime is 12399041. The next prime is 12399061. The reversal of 12399049 is 94099321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94099321 = 373 ⋅252277.

It can be written as a sum of positive squares in 2 ways, for example, as 1607824 + 10791225 = 1268^2 + 3285^2 .

It is a cyclic number.

It is not a de Polignac number, because 12399049 - 2³ = 12399041 is a prime.

It is a super-2 number, since 2×12399049² = 307472832208802, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12398999 and 12399017.

It is not an unprimeable number, because it can be changed into a prime (12399041) 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, 476874 + ... + 476899.

It is an arithmetic number, because the mean of its divisors is an integer number (3338209).

Almost surely, 2^12399049 is an apocalyptic number.

It is an amenable number.

12399049 is a deficient number, since it is larger than the sum of its proper divisors (953787).

12399049 is an equidigital number, since it uses as much as digits as its factorization.

12399049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 953786.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 12399049 is about 3521.2283368166. The cubic root of 12399049 is about 231.4529881664.

The spelling of 12399049 in words is "twelve million, three hundred ninety-nine thousand, forty-nine".