1998568 has 32 divisors (see below), whose sum is σ = 4404960. Its totient is φ = 838080.

The previous prime is 1998559. The next prime is 1998569. The reversal of 1998568 is 8658991.

It is not an unprimeable number, because it can be changed into a prime (1998569) 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, 271 + ... + 2017.

It is an arithmetic number, because the mean of its divisors is an integer number (137655).

2^1998568 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1998568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2202480).

1998568 is an abundant number, since it is smaller than the sum of its proper divisors (2406392).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1998568 is a wasteful number, since it uses less digits than its factorization.

1998568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1777 (or 1773 counting only the distinct ones).

The product of its digits is 155520, while the sum is 46.

The square root of 1998568 is about 1413.7071832597. The cubic root of 1998568 is about 125.9620276942.

The spelling of 1998568 in words is "one million, nine hundred ninety-eight thousand, five hundred sixty-eight".