123206399 has 4 divisors (see below), whose sum is σ = 123474120. Its totient is φ = 122938680.

The previous prime is 123206389. The next prime is 123206401. The reversal of 123206399 is 993602321.

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 123206399 - 2⁸ = 123206143 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 (123206359) 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, 133169 + ... + 134090.

It is an arithmetic number, because the mean of its divisors is an integer number (30868530).

Almost surely, 2^123206399 is an apocalyptic number.

123206399 is a deficient number, since it is larger than the sum of its proper divisors (267721).

123206399 is an equidigital number, since it uses as much as digits as its factorization.

123206399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267720.

The product of its (nonzero) digits is 17496, while the sum is 35.

The square root of 123206399 is about 11099.8377916076. The cubic root of 123206399 is about 497.5970016995.

The spelling of 123206399 in words is "one hundred twenty-three million, two hundred six thousand, three hundred ninety-nine".