123799391 has 2 divisors, whose sum is σ = 123799392. Its totient is φ = 123799390.

The previous prime is 123799349. The next prime is 123799483. The reversal of 123799391 is 193997321.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123799391 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123799301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61899695 + 61899696.

It is an arithmetic number, because the mean of its divisors is an integer number (61899696).

Almost surely, 2^123799391 is an apocalyptic number.

123799391 is a deficient number, since it is larger than the sum of its proper divisors (1).

123799391 is an equidigital number, since it uses as much as digits as its factorization.

123799391 is an odious number, because the sum of its binary digits is odd.

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

The square root of 123799391 is about 11126.5174695410. The cubic root of 123799391 is about 498.3940352773.

The spelling of 123799391 in words is "one hundred twenty-three million, seven hundred ninety-nine thousand, three hundred ninety-one".