68684939 has 2 divisors, whose sum is σ = 68684940. Its totient is φ = 68684938.

The previous prime is 68684857. The next prime is 68684951. The reversal of 68684939 is 93948686.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68684939 - 2⁸ = 68684683 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68684339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34342469 + 34342470.

It is an arithmetic number, because the mean of its divisors is an integer number (34342470).

Almost surely, 2^68684939 is an apocalyptic number.

68684939 is a deficient number, since it is larger than the sum of its proper divisors (1).

68684939 is an equidigital number, since it uses as much as digits as its factorization.

68684939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2239488, while the sum is 53.

The square root of 68684939 is about 8287.6377213293. The cubic root of 68684939 is about 409.5313681846.

The spelling of 68684939 in words is "sixty-eight million, six hundred eighty-four thousand, nine hundred thirty-nine".