123243999 has 16 divisors (see below), whose sum is σ = 174256992. Its totient is φ = 77211648.

The previous prime is 123243947. The next prime is 123244007. The reversal of 123243999 is 999342321.

It is not a de Polignac number, because 123243999 - 2⁹ = 123243487 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123243999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123343999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42087 + ... + 44919.

It is an arithmetic number, because the mean of its divisors is an integer number (10891062).

Almost surely, 2^123243999 is an apocalyptic number.

123243999 is a deficient number, since it is larger than the sum of its proper divisors (51012993).

123243999 is a wasteful number, since it uses less digits than its factorization.

123243999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3706.

The product of its digits is 104976, while the sum is 42.

The square root of 123243999 is about 11101.5313808501. The cubic root of 123243999 is about 497.6476152620.

The spelling of 123243999 in words is "one hundred twenty-three million, two hundred forty-three thousand, nine hundred ninety-nine".