12399799 has 4 divisors (see below), whose sum is σ = 13052440. Its totient is φ = 11747160.

The previous prime is 12399787. The next prime is 12399809. The reversal of 12399799 is 99799321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99799321 = 2917 ⋅34213.

It is a cyclic number.

It is not a de Polignac number, because 12399799 - 2¹³ = 12391607 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 (12399769) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 326292 + ... + 326329.

It is an arithmetic number, because the mean of its divisors is an integer number (3263110).

Almost surely, 2^12399799 is an apocalyptic number.

12399799 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

12399799 is a deficient number, since it is larger than the sum of its proper divisors (652641).

12399799 is an equidigital number, since it uses as much as digits as its factorization.

12399799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652640.

The product of its digits is 275562, while the sum is 49.

The square root of 12399799 is about 3521.3348321340. The cubic root of 12399799 is about 231.4576548211.

The spelling of 12399799 in words is "twelve million, three hundred ninety-nine thousand, seven hundred ninety-nine".