38656729 has 2 divisors, whose sum is σ = 38656730. Its totient is φ = 38656728.

The previous prime is 38656711. The next prime is 38656733. The reversal of 38656729 is 92765683.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21641104 + 17015625 = 4652^2 + 4125^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38656729 is a prime.

It is not a weakly prime, because it can be changed into another prime (38656799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19328364 + 19328365.

It is an arithmetic number, because the mean of its divisors is an integer number (19328365).

Almost surely, 2^38656729 is an apocalyptic number.

It is an amenable number.

38656729 is a deficient number, since it is larger than the sum of its proper divisors (1).

38656729 is an equidigital number, since it uses as much as digits as its factorization.

38656729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 46.

The square root of 38656729 is about 6217.4535784355. The cubic root of 38656729 is about 338.1232496382.

The spelling of 38656729 in words is "thirty-eight million, six hundred fifty-six thousand, seven hundred twenty-nine".