12789999 has 12 divisors (see below), whose sum is σ = 18536856. Its totient is φ = 8497872.

The previous prime is 12789979. The next prime is 12790007. The reversal of 12789999 is 99998721.

It is not a de Polignac number, because 12789999 - 2⁷ = 12789871 is a prime.

12789999 is a modest number, since divided by 9999 gives 1278 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12789919) 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 11 ways as a sum of consecutive naturals, for example, 612 + ... + 5094.

It is an arithmetic number, because the mean of its divisors is an integer number (1544738).

Almost surely, 2^12789999 is an apocalyptic number.

12789999 is a deficient number, since it is larger than the sum of its proper divisors (5746857).

12789999 is a wasteful number, since it uses less digits than its factorization.

12789999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4806 (or 4803 counting only the distinct ones).

The product of its digits is 734832, while the sum is 54.

The square root of 12789999 is about 3576.3108086407. The cubic root of 12789999 is about 233.8604800552.

The spelling of 12789999 in words is "twelve million, seven hundred eighty-nine thousand, nine hundred ninety-nine".