68405903 has 2 divisors, whose sum is σ = 68405904. Its totient is φ = 68405902.

The previous prime is 68405851. The next prime is 68405921. The reversal of 68405903 is 30950486.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68405903 is a prime.

It is equal to p_4029794 and since 68405903 and 4029794 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68405963) 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, 34202951 + 34202952.

It is an arithmetic number, because the mean of its divisors is an integer number (34202952).

Almost surely, 2^68405903 is an apocalyptic number.

68405903 is a deficient number, since it is larger than the sum of its proper divisors (1).

68405903 is an equidigital number, since it uses as much as digits as its factorization.

68405903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 68405903 is about 8270.7861174135. The cubic root of 68405903 is about 408.9760349259.

The spelling of 68405903 in words is "sixty-eight million, four hundred five thousand, nine hundred three".