38340209 has 2 divisors, whose sum is σ = 38340210. Its totient is φ = 38340208.

The previous prime is 38340187. The next prime is 38340217. The reversal of 38340209 is 90204383.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31888609 + 6451600 = 5647^2 + 2540^2 .

It is a cyclic number.

It is not a de Polignac number, because 38340209 - 2¹² = 38336113 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 (38343209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19170104 + 19170105.

It is an arithmetic number, because the mean of its divisors is an integer number (19170105).

Almost surely, 2^38340209 is an apocalyptic number.

It is an amenable number.

38340209 is a deficient number, since it is larger than the sum of its proper divisors (1).

38340209 is an equidigital number, since it uses as much as digits as its factorization.

38340209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 38340209 is about 6191.9471089472. The cubic root of 38340209 is about 337.1978720960.

The spelling of 38340209 in words is "thirty-eight million, three hundred forty thousand, two hundred nine".