3898437006809 has 2 divisors, whose sum is σ = 3898437006810. Its totient is φ = 3898437006808.

The previous prime is 3898437006803. The next prime is 3898437006811. The reversal of 3898437006809 is 9086007348983.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2761569269209 + 1136867737600 = 1661797^2 + 1066240^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3898437006809 is a prime.

It is a super-2 number, since 2×3898437006809² (a number of 26 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 3898437006811, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (3898437006803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1949218503404 + 1949218503405.

It is an arithmetic number, because the mean of its divisors is an integer number (1949218503405).

Almost surely, 2^{3898437006809} is an apocalyptic number.

It is an amenable number.

3898437006809 is a deficient number, since it is larger than the sum of its proper divisors (1).

3898437006809 is an equidigital number, since it uses as much as digits as its factorization.

3898437006809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62705664, while the sum is 65.

The spelling of 3898437006809 in words is "three trillion, eight hundred ninety-eight billion, four hundred thirty-seven million, six thousand, eight hundred nine".