38928209 has 2 divisors, whose sum is σ = 38928210. Its totient is φ = 38928208.

The previous prime is 38928193. The next prime is 38928217. The reversal of 38928209 is 90282983.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22118209 + 16810000 = 4703^2 + 4100^2 .

It is a cyclic number.

It is not a de Polignac number, because 38928209 - 2⁴ = 38928193 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 (38928269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19464104 + 19464105.

It is an arithmetic number, because the mean of its divisors is an integer number (19464105).

Almost surely, 2^38928209 is an apocalyptic number.

It is an amenable number.

38928209 is a deficient number, since it is larger than the sum of its proper divisors (1).

38928209 is an equidigital number, since it uses as much as digits as its factorization.

38928209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 38928209 is about 6239.2474706490. The cubic root of 38928209 is about 338.9129323362.

The spelling of 38928209 in words is "thirty-eight million, nine hundred twenty-eight thousand, two hundred nine".