79199399 has 4 divisors (see below), whose sum is σ = 79217280. Its totient is φ = 79181520.

The previous prime is 79199383. The next prime is 79199401. The reversal of 79199399 is 99399197.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 99399197 = 661 ⋅150377.

It is a cyclic number.

It is not a de Polignac number, because 79199399 - 2⁴ = 79199383 is a prime.

It is a super-2 number, since 2×79199399² = 12545089603922402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79199599) 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, 3194 + ... + 12984.

It is an arithmetic number, because the mean of its divisors is an integer number (19804320).

Almost surely, 2^79199399 is an apocalyptic number.

79199399 is a deficient number, since it is larger than the sum of its proper divisors (17881).

79199399 is an equidigital number, since it uses as much as digits as its factorization.

79199399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17880.

The product of its digits is 1240029, while the sum is 56.

The square root of 79199399 is about 8899.4044182743. The cubic root of 79199399 is about 429.4447475344. Note that the first 3 decimals are identical.

The spelling of 79199399 in words is "seventy-nine million, one hundred ninety-nine thousand, three hundred ninety-nine".