38865209 has 2 divisors, whose sum is σ = 38865210. Its totient is φ = 38865208.

The previous prime is 38865181. The next prime is 38865217. The reversal of 38865209 is 90256883.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38402809 + 462400 = 6197^2 + 680^2 .

It is a cyclic number.

It is not a de Polignac number, because 38865209 - 2¹² = 38861113 is a prime.

It is a super-2 number, since 2×38865209² = 3021008941227362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (38865259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19432604 + 19432605.

It is an arithmetic number, because the mean of its divisors is an integer number (19432605).

Almost surely, 2^38865209 is an apocalyptic number.

It is an amenable number.

38865209 is a deficient number, since it is larger than the sum of its proper divisors (1).

38865209 is an equidigital number, since it uses as much as digits as its factorization.

38865209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 38865209 is about 6234.1967405593. The cubic root of 38865209 is about 338.7300054919.

The spelling of 38865209 in words is "thirty-eight million, eight hundred sixty-five thousand, two hundred nine".