123936139 has 2 divisors, whose sum is σ = 123936140. Its totient is φ = 123936138.

The previous prime is 123936097. The next prime is 123936151. The reversal of 123936139 is 931639321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123936139 - 2¹¹ = 123934091 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123936098 and 123936107.

It is not a weakly prime, because it can be changed into another prime (123436139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61968069 + 61968070.

It is an arithmetic number, because the mean of its divisors is an integer number (61968070).

Almost surely, 2^123936139 is an apocalyptic number.

123936139 is a deficient number, since it is larger than the sum of its proper divisors (1).

123936139 is an equidigital number, since it uses as much as digits as its factorization.

123936139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26244, while the sum is 37.

The square root of 123936139 is about 11132.6609128276. The cubic root of 123936139 is about 498.5774753520.

The spelling of 123936139 in words is "one hundred twenty-three million, nine hundred thirty-six thousand, one hundred thirty-nine".