123391799 has 4 divisors (see below), whose sum is σ = 123786336. Its totient is φ = 122997264.

The previous prime is 123391789. The next prime is 123391813. The reversal of 123391799 is 997193321.

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 123391799 - 2¹⁶ = 123326263 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 (123391789) 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, 196799 + ... + 197424.

It is an arithmetic number, because the mean of its divisors is an integer number (30946584).

Almost surely, 2^123391799 is an apocalyptic number.

123391799 is a deficient number, since it is larger than the sum of its proper divisors (394537).

123391799 is an equidigital number, since it uses as much as digits as its factorization.

123391799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394536.

The product of its digits is 91854, while the sum is 44.

The square root of 123391799 is about 11108.1861255562. The cubic root of 123391799 is about 497.8464699330.

The spelling of 123391799 in words is "one hundred twenty-three million, three hundred ninety-one thousand, seven hundred ninety-nine".