1998480 has 80 divisors (see below), whose sum is σ = 6767424. Its totient is φ = 483840.

The previous prime is 1998473. The next prime is 1998497. The reversal of 1998480 is 848991.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2262 + ... + 3018.

2^1998480 is an apocalyptic number.

1998480 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 1998480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3383712).

1998480 is an abundant number, since it is smaller than the sum of its proper divisors (4768944).

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

1998480 is a wasteful number, since it uses less digits than its factorization.

1998480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784 (or 778 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 1998480 is about 1413.6760590744. The cubic root of 1998480 is about 125.9601789002.

The spelling of 1998480 in words is "one million, nine hundred ninety-eight thousand, four hundred eighty".