3998009 has 4 divisors (see below), whose sum is σ = 4233204. Its totient is φ = 3762816.

The previous prime is 3998003. The next prime is 3998041. The reversal of 3998009 is 9008993.

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 2941225 + 1056784 = 1715^2 + 1028^2 .

It is a cyclic number.

It is not a de Polignac number, because 3998009 - 2⁴ = 3997993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3998003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117572 + ... + 117605.

It is an arithmetic number, because the mean of its divisors is an integer number (1058301).

Almost surely, 2^3998009 is an apocalyptic number.

It is an amenable number.

3998009 is a deficient number, since it is larger than the sum of its proper divisors (235195).

3998009 is a wasteful number, since it uses less digits than its factorization.

3998009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235194.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 3998009 is about 1999.5021880458. The cubic root of 3998009 is about 158.7137631966.

The spelling of 3998009 in words is "three million, nine hundred ninety-eight thousand, nine".