6398989 has 4 divisors (see below), whose sum is σ = 6605440. Its totient is φ = 6192540.

The previous prime is 6398983. The next prime is 6398999. The reversal of 6398989 is 9898936.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6398989 - 2³ = 6398981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6398981) 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, 103179 + ... + 103240.

It is an arithmetic number, because the mean of its divisors is an integer number (1651360).

Almost surely, 2^6398989 is an apocalyptic number.

It is an amenable number.

6398989 is a deficient number, since it is larger than the sum of its proper divisors (206451).

6398989 is a wasteful number, since it uses less digits than its factorization.

6398989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206450.

The product of its digits is 839808, while the sum is 52.

The square root of 6398989 is about 2529.6223038232. The cubic root of 6398989 is about 185.6537764832.

The spelling of 6398989 in words is "six million, three hundred ninety-eight thousand, nine hundred eighty-nine".