1998680 has 32 divisors (see below), whose sum is σ = 4654800. Its totient is φ = 771456.

The previous prime is 1998679. The next prime is 1998691. The reversal of 1998680 is 868991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 299 + ... + 2021.

2^1998680 is an apocalyptic number.

1998680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1998680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2327400).

1998680 is an abundant number, since it is smaller than the sum of its proper divisors (2656120).

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

1998680 is a wasteful number, since it uses less digits than its factorization.

1998680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1763 (or 1759 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 1998680 is about 1413.7467948682. The cubic root of 1998680 is about 125.9643806261.

The spelling of 1998680 in words is "one million, nine hundred ninety-eight thousand, six hundred eighty".