12309999 has 16 divisors (see below), whose sum is σ = 17740800. Its totient is φ = 7547616.

The previous prime is 12309961. The next prime is 12310013. The reversal of 12309999 is 99990321.

It is a happy number.

12309999 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-12309999 is a prime.

12309999 is a modest number, since divided by 9999 gives 1230 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 12309999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12309299) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16762 + ... + 17480.

It is an arithmetic number, because the mean of its divisors is an integer number (1108800).

Almost surely, 2^12309999 is an apocalyptic number.

12309999 is a deficient number, since it is larger than the sum of its proper divisors (5430801).

12309999 is a wasteful number, since it uses less digits than its factorization.

12309999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1174.

The product of its (nonzero) digits is 39366, while the sum is 42.

The square root of 12309999 is about 3508.5608160612. The cubic root of 12309999 is about 230.8975576947.

The spelling of 12309999 in words is "twelve million, three hundred nine thousand, nine hundred ninety-nine".