68138927 has 2 divisors, whose sum is σ = 68138928. Its totient is φ = 68138926.

The previous prime is 68138909. The next prime is 68138963. The reversal of 68138927 is 72983186.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68138927 - 2⁸ = 68138671 is a prime.

It is a super-2 number, since 2×68138927² = 9285826745422658, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68138977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34069463 + 34069464.

It is an arithmetic number, because the mean of its divisors is an integer number (34069464).

Almost surely, 2^68138927 is an apocalyptic number.

68138927 is a deficient number, since it is larger than the sum of its proper divisors (1).

68138927 is an equidigital number, since it uses as much as digits as its factorization.

68138927 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 44.

The square root of 68138927 is about 8254.6306398288. The cubic root of 68138927 is about 408.4432878218.

The spelling of 68138927 in words is "sixty-eight million, one hundred thirty-eight thousand, nine hundred twenty-seven".