13123999 has 4 divisors (see below), whose sum is σ = 14998864. Its totient is φ = 11249136.

The previous prime is 13123997. The next prime is 13124021. The reversal of 13123999 is 99932131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99932131 = 13 ⋅7687087.

It is a cyclic number.

It is not a de Polignac number, because 13123999 - 2¹ = 13123997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13123991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 937422 + ... + 937435.

It is an arithmetic number, because the mean of its divisors is an integer number (3749716).

Almost surely, 2^13123999 is an apocalyptic number.

13123999 is a deficient number, since it is larger than the sum of its proper divisors (1874865).

13123999 is an equidigital number, since it uses as much as digits as its factorization.

13123999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1874864.

The product of its digits is 13122, while the sum is 37.

The square root of 13123999 is about 3622.7060327882. The cubic root of 13123999 is about 235.8787021501.

The spelling of 13123999 in words is "thirteen million, one hundred twenty-three thousand, nine hundred ninety-nine".