123931399 has 2 divisors, whose sum is σ = 123931400. Its totient is φ = 123931398.

The previous prime is 123931393. The next prime is 123931417. The reversal of 123931399 is 993139321.

It is a weak prime.

It is an emirp because it is prime and its reverse (993139321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123931399 - 2³ = 123931391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123931391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61965699 + 61965700.

It is an arithmetic number, because the mean of its divisors is an integer number (61965700).

Almost surely, 2^123931399 is an apocalyptic number.

123931399 is a deficient number, since it is larger than the sum of its proper divisors (1).

123931399 is an equidigital number, since it uses as much as digits as its factorization.

123931399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39366, while the sum is 40.

The square root of 123931399 is about 11132.4480236828. The cubic root of 123931399 is about 498.5711191555.

The spelling of 123931399 in words is "one hundred twenty-three million, nine hundred thirty-one thousand, three hundred ninety-nine".