38841809 has 2 divisors, whose sum is σ = 38841810. Its totient is φ = 38841808.

The previous prime is 38841793. The next prime is 38841839. The reversal of 38841809 is 90814883.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38093584 + 748225 = 6172^2 + 865^2 .

It is an emirp because it is prime and its reverse (90814883) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38841809 - 2⁴ = 38841793 is a prime.

It is a super-2 number, since 2×38841809² = 3017372252784962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (38841839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19420904 + 19420905.

It is an arithmetic number, because the mean of its divisors is an integer number (19420905).

Almost surely, 2^38841809 is an apocalyptic number.

It is an amenable number.

38841809 is a deficient number, since it is larger than the sum of its proper divisors (1).

38841809 is an equidigital number, since it uses as much as digits as its factorization.

38841809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55296, while the sum is 41.

The square root of 38841809 is about 6232.3197125950. The cubic root of 38841809 is about 338.6620108885.

The spelling of 38841809 in words is "thirty-eight million, eight hundred forty-one thousand, eight hundred nine".