12159999 has 6 divisors (see below), whose sum is σ = 17564456. Its totient is φ = 8106660.

The previous prime is 12159991. The next prime is 12160003. The reversal of 12159999 is 99995121.

It is not a de Polignac number, because 12159999 - 2³ = 12159991 is a prime.

It is a Duffinian number.

12159999 is a modest number, since divided by 9999 gives 1215 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12159991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 675547 + ... + 675564.

Almost surely, 2^12159999 is an apocalyptic number.

12159999 is a deficient number, since it is larger than the sum of its proper divisors (5404457).

12159999 is a wasteful number, since it uses less digits than its factorization.

12159999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1351117 (or 1351114 counting only the distinct ones).

The product of its digits is 65610, while the sum is 45.

The square root of 12159999 is about 3487.1190114477. The cubic root of 12159999 is about 229.9558768542.

The spelling of 12159999 in words is "twelve million, one hundred fifty-nine thousand, nine hundred ninety-nine".