8643998 has 24 divisors (see below), whose sum is σ = 14881104. Its totient is φ = 3755840.

The previous prime is 8643997. The next prime is 8644019. The reversal of 8643998 is 8993468.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8643991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4790 + ... + 6342.

It is an arithmetic number, because the mean of its divisors is an integer number (620046).

Almost surely, 2^8643998 is an apocalyptic number.

8643998 is a deficient number, since it is larger than the sum of its proper divisors (6237106).

8643998 is a wasteful number, since it uses less digits than its factorization.

8643998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1600 (or 1589 counting only the distinct ones).

The product of its digits is 373248, while the sum is 47.

The square root of 8643998 is about 2940.0676862957. The cubic root of 8643998 is about 205.2287591087.

The spelling of 8643998 in words is "eight million, six hundred forty-three thousand, nine hundred ninety-eight".