3998194009 has 4 divisors (see below), whose sum is σ = 3998528820. Its totient is φ = 3997859200.

The previous prime is 3998194003. The next prime is 3998194027. The reversal of 3998194009 is 9004918993.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 428490000 + 3569704009 = 20700^2 + 59747^2 .

It is a cyclic number.

It is not a de Polignac number, because 3998194009 - 2⁹ = 3998193497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3998194003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148804 + ... + 173605.

It is an arithmetic number, because the mean of its divisors is an integer number (999632205).

Almost surely, 2^3998194009 is an apocalyptic number.

It is an amenable number.

3998194009 is a deficient number, since it is larger than the sum of its proper divisors (334811).

3998194009 is a wasteful number, since it uses less digits than its factorization.

3998194009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334810.

The product of its (nonzero) digits is 629856, while the sum is 52.

The square root of 3998194009 is about 63231.2739789418. The cubic root of 3998194009 is about 1587.1621133367.

The spelling of 3998194009 in words is "three billion, nine hundred ninety-eight million, one hundred ninety-four thousand, nine".