123223999 has 4 divisors (see below), whose sum is σ = 123767064. Its totient is φ = 122680936.

The previous prime is 123223981. The next prime is 123224011. The reversal of 123223999 is 999322321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999322321 = 233 ⋅4288937.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123223999 is a prime.

It is a Smith number, since the sum of its digits (40) 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 (123223099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 271192 + ... + 271645.

It is an arithmetic number, because the mean of its divisors is an integer number (30941766).

Almost surely, 2^123223999 is an apocalyptic number.

123223999 is a deficient number, since it is larger than the sum of its proper divisors (543065).

123223999 is an equidigital number, since it uses as much as digits as its factorization.

123223999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543064.

The product of its digits is 52488, while the sum is 40.

The square root of 123223999 is about 11100.6305676750. The cubic root of 123223999 is about 497.6206944360.

The spelling of 123223999 in words is "one hundred twenty-three million, two hundred twenty-three thousand, nine hundred ninety-nine".