38678729 has 2 divisors, whose sum is σ = 38678730. Its totient is φ = 38678728.

The previous prime is 38678713. The next prime is 38678749. The reversal of 38678729 is 92787683.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33085504 + 5593225 = 5752^2 + 2365^2 .

It is a cyclic number.

It is not a de Polignac number, because 38678729 - 2⁴ = 38678713 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (38678749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19339364 + 19339365.

It is an arithmetic number, because the mean of its divisors is an integer number (19339365).

Almost surely, 2^38678729 is an apocalyptic number.

It is an amenable number.

38678729 is a deficient number, since it is larger than the sum of its proper divisors (1).

38678729 is an equidigital number, since it uses as much as digits as its factorization.

38678729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 50.

The square root of 38678729 is about 6219.2225398357. Note that the first 3 decimals coincide. The cubic root of 38678729 is about 338.1873807824.

The spelling of 38678729 in words is "thirty-eight million, six hundred seventy-eight thousand, seven hundred twenty-nine".