12399121 has 8 divisors (see below), whose sum is σ = 14341824. Its totient is φ = 10499280.

The previous prime is 12399119. The next prime is 12399143. The reversal of 12399121 is 12199321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12399121 - 2¹ = 12399119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12399121.

It is not an unprimeable number, because it can be changed into a prime (12399161) 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 7 ways as a sum of consecutive naturals, for example, 10090 + ... + 11251.

It is an arithmetic number, because the mean of its divisors is an integer number (1792728).

Almost surely, 2^12399121 is an apocalyptic number.

It is an amenable number.

12399121 is a deficient number, since it is larger than the sum of its proper divisors (1942703).

12399121 is an equidigital number, since it uses as much as digits as its factorization.

12399121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21431.

The product of its digits is 972, while the sum is 28.

The square root of 12399121 is about 3521.2385605068. The cubic root of 12399121 is about 231.4534361734.

The spelling of 12399121 in words is "twelve million, three hundred ninety-nine thousand, one hundred twenty-one".