38865809 has 2 divisors, whose sum is σ = 38865810. Its totient is φ = 38865808.

The previous prime is 38865793. The next prime is 38865833. The reversal of 38865809 is 90856883.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25725184 + 13140625 = 5072^2 + 3625^2 .

It is a cyclic number.

It is not a de Polignac number, because 38865809 - 2⁴ = 38865793 is a prime.

It is a super-2 number, since 2×38865809² = 3021102218448962, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (38865839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19432904 + 19432905.

It is an arithmetic number, because the mean of its divisors is an integer number (19432905).

Almost surely, 2^38865809 is an apocalyptic number.

It is an amenable number.

38865809 is a deficient number, since it is larger than the sum of its proper divisors (1).

38865809 is an equidigital number, since it uses as much as digits as its factorization.

38865809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 414720, while the sum is 47.

The square root of 38865809 is about 6234.2448620503. The cubic root of 38865809 is about 338.7317485843.

The spelling of 38865809 in words is "thirty-eight million, eight hundred sixty-five thousand, eight hundred nine".