123099799 has 4 divisors (see below), whose sum is σ = 123363864. Its totient is φ = 122835736.

The previous prime is 123099797. The next prime is 123099829. The reversal of 123099799 is 997990321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 997990321 = 17 ⋅58705313.

It is a cyclic number.

It is not a de Polignac number, because 123099799 - 2¹ = 123099797 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123099793) 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, 131332 + ... + 132265.

It is an arithmetic number, because the mean of its divisors is an integer number (30840966).

Almost surely, 2^123099799 is an apocalyptic number.

123099799 is a deficient number, since it is larger than the sum of its proper divisors (264065).

123099799 is an equidigital number, since it uses as much as digits as its factorization.

123099799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264064.

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

The square root of 123099799 is about 11095.0348805220. The cubic root of 123099799 is about 497.4534508605.

The spelling of 123099799 in words is "one hundred twenty-three million, ninety-nine thousand, seven hundred ninety-nine".