3998090809 has 8 divisors (see below), whose sum is σ = 4067219520. Its totient is φ = 3929007696.

The previous prime is 3998090797. The next prime is 3998090839. The reversal of 3998090809 is 9080908993.

3998090809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3998090809 - 2¹⁵ = 3998058041 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3998090809.

It is not an unprimeable number, because it can be changed into a prime (3998090839) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198487 + ... + 217699.

It is an arithmetic number, because the mean of its divisors is an integer number (508402440).

Almost surely, 2^3998090809 is an apocalyptic number.

It is an amenable number.

3998090809 is a deficient number, since it is larger than the sum of its proper divisors (69128711).

3998090809 is a wasteful number, since it uses less digits than its factorization.

3998090809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22799.

The product of its (nonzero) digits is 1259712, while the sum is 55.

The square root of 3998090809 is about 63230.4579217959. The cubic root of 3998090809 is about 1587.1484574595.

The spelling of 3998090809 in words is "three billion, nine hundred ninety-eight million, ninety thousand, eight hundred nine".