68393639 has 2 divisors, whose sum is σ = 68393640. Its totient is φ = 68393638.

The previous prime is 68393623. The next prime is 68393641. The reversal of 68393639 is 93639386.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68393639 - 2⁴ = 68393623 is a prime.

Together with 68393641, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 68393593 and 68393602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68393609) 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, 34196819 + 34196820.

It is an arithmetic number, because the mean of its divisors is an integer number (34196820).

Almost surely, 2^68393639 is an apocalyptic number.

68393639 is a deficient number, since it is larger than the sum of its proper divisors (1).

68393639 is an equidigital number, since it uses as much as digits as its factorization.

68393639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 629856, while the sum is 47.

The square root of 68393639 is about 8270.0446794440. The cubic root of 68393639 is about 408.9515926792.

The spelling of 68393639 in words is "sixty-eight million, three hundred ninety-three thousand, six hundred thirty-nine".