123099 has 8 divisors (see below), whose sum is σ = 168720. Its totient is φ = 79776.

The previous prime is 123091. The next prime is 123113. The reversal of 123099 is 990321.

It is a happy number.

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

It is not a de Polignac number, because 123099 - 2³ = 123091 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (123091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 444 + ... + 665.

It is an arithmetic number, because the mean of its divisors is an integer number (21090).

2¹²³⁰⁹⁹ is an apocalyptic number.

123099 is a deficient number, since it is larger than the sum of its proper divisors (45621).

123099 is a wasteful number, since it uses less digits than its factorization.

123099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1149.

The product of its (nonzero) digits is 486, while the sum is 24.

The square root of 123099 is about 350.8546707684. The cubic root of 123099 is about 49.7452374590.

The spelling of 123099 in words is "one hundred twenty-three thousand, ninety-nine".