68409739 has 2 divisors, whose sum is σ = 68409740. Its totient is φ = 68409738.

The previous prime is 68409703. The next prime is 68409743. The reversal of 68409739 is 93790486.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68409739 - 2²⁵ = 34855307 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68409239) 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, 34204869 + 34204870.

It is an arithmetic number, because the mean of its divisors is an integer number (34204870).

Almost surely, 2^68409739 is an apocalyptic number.

68409739 is a deficient number, since it is larger than the sum of its proper divisors (1).

68409739 is an equidigital number, since it uses as much as digits as its factorization.

68409739 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 68409739 is about 8271.0180147307. The cubic root of 68409739 is about 408.9836795037.

The spelling of 68409739 in words is "sixty-eight million, four hundred nine thousand, seven hundred thirty-nine".