123520939 has 2 divisors, whose sum is σ = 123520940. Its totient is φ = 123520938.

The previous prime is 123520937. The next prime is 123520949. The reversal of 123520939 is 939025321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123520939 - 2¹ = 123520937 is a prime.

Together with 123520937, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (123520931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61760469 + 61760470.

It is an arithmetic number, because the mean of its divisors is an integer number (61760470).

Almost surely, 2^123520939 is an apocalyptic number.

123520939 is a deficient number, since it is larger than the sum of its proper divisors (1).

123520939 is an equidigital number, since it uses as much as digits as its factorization.

123520939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14580, while the sum is 34.

The square root of 123520939 is about 11113.9974356664. The cubic root of 123520939 is about 498.0200889194.

The spelling of 123520939 in words is "one hundred twenty-three million, five hundred twenty thousand, nine hundred thirty-nine".