12945599 has 4 divisors (see below), whose sum is σ = 13002360. Its totient is φ = 12888840.

The previous prime is 12945587. The next prime is 12945607. The reversal of 12945599 is 99554921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99554921 = 113 ⋅881017.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12945599 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 (12945799) 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, 28037 + ... + 28494.

It is an arithmetic number, because the mean of its divisors is an integer number (3250590).

Almost surely, 2^12945599 is an apocalyptic number.

12945599 is a deficient number, since it is larger than the sum of its proper divisors (56761).

12945599 is an equidigital number, since it uses as much as digits as its factorization.

12945599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56760.

The product of its digits is 145800, while the sum is 44.

The square root of 12945599 is about 3597.9993051695. Note that the first 3 decimals coincide. The cubic root of 12945599 is about 234.8050231245.

The spelling of 12945599 in words is "twelve million, nine hundred forty-five thousand, five hundred ninety-nine".