4089986809 has 2 divisors, whose sum is σ = 4089986810. Its totient is φ = 4089986808.

The previous prime is 4089986807. The next prime is 4089986827. The reversal of 4089986809 is 9086899804.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3968370025 + 121616784 = 62995^2 + 11028^2 .

It is a cyclic number.

It is not a de Polignac number, because 4089986809 - 2¹ = 4089986807 is a prime.

Together with 4089986807, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (4089986807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2044993404 + 2044993405.

It is an arithmetic number, because the mean of its divisors is an integer number (2044993405).

Almost surely, 2^4089986809 is an apocalyptic number.

It is an amenable number.

4089986809 is a deficient number, since it is larger than the sum of its proper divisors (1).

4089986809 is an equidigital number, since it uses as much as digits as its factorization.

4089986809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8957952, while the sum is 61.

The square root of 4089986809 is about 63953.0046909447. The cubic root of 4089986809 is about 1599.2166489602.

The spelling of 4089986809 in words is "four billion, eighty-nine million, nine hundred eighty-six thousand, eight hundred nine".