123243199 has 4 divisors (see below), whose sum is σ = 124931536. Its totient is φ = 121554864.

The previous prime is 123243191. The next prime is 123243209. The reversal of 123243199 is 991342321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 123243199 - 2³ = 123243191 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 (123243191) 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, 844059 + ... + 844204.

It is an arithmetic number, because the mean of its divisors is an integer number (31232884).

Almost surely, 2^123243199 is an apocalyptic number.

123243199 is a deficient number, since it is larger than the sum of its proper divisors (1688337).

123243199 is an equidigital number, since it uses as much as digits as its factorization.

123243199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1688336.

The product of its digits is 11664, while the sum is 34.

The square root of 123243199 is about 11101.4953497265. The cubic root of 123243199 is about 497.6465384849.

The spelling of 123243199 in words is "one hundred twenty-three million, two hundred forty-three thousand, one hundred ninety-nine".