68005939 has 2 divisors, whose sum is σ = 68005940. Its totient is φ = 68005938.

The previous prime is 68005897. The next prime is 68005979. The reversal of 68005939 is 93950086.

It is an a-pointer prime, because the next prime (68005979) can be obtained adding 68005939 to its sum of digits (40).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68005939 - 2⁷ = 68005811 is a prime.

It is not a weakly prime, because it can be changed into another prime (68005979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34002969 + 34002970.

It is an arithmetic number, because the mean of its divisors is an integer number (34002970).

Almost surely, 2^68005939 is an apocalyptic number.

68005939 is a deficient number, since it is larger than the sum of its proper divisors (1).

68005939 is an equidigital number, since it uses as much as digits as its factorization.

68005939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 68005939 is about 8246.5713481422. The cubic root of 68005939 is about 408.1773926643.

The spelling of 68005939 in words is "sixty-eight million, five thousand, nine hundred thirty-nine".