12978599 has 4 divisors (see below), whose sum is σ = 13742064. Its totient is φ = 12215136.

The previous prime is 12978593. The next prime is 12978611. The reversal of 12978599 is 99587921.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99587921 = 17 ⋅5858113.

It is a cyclic number.

It is not a de Polignac number, because 12978599 - 2⁴ = 12978583 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 (12978593) 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, 381707 + ... + 381740.

It is an arithmetic number, because the mean of its divisors is an integer number (3435516).

Almost surely, 2^12978599 is an apocalyptic number.

12978599 is a deficient number, since it is larger than the sum of its proper divisors (763465).

12978599 is an equidigital number, since it uses as much as digits as its factorization.

12978599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 763464.

The product of its digits is 408240, while the sum is 50.

The square root of 12978599 is about 3602.5822683181. The cubic root of 12978599 is about 235.0043699202.

The spelling of 12978599 in words is "twelve million, nine hundred seventy-eight thousand, five hundred ninety-nine".