1998320 has 20 divisors (see below), whose sum is σ = 4646280. Its totient is φ = 799296.

The previous prime is 1998319. The next prime is 1998329. The reversal of 1998320 is 238991.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998329) 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, 12410 + ... + 12569.

It is an arithmetic number, because the mean of its divisors is an integer number (232314).

2^1998320 is an apocalyptic number.

1998320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1998320 is an abundant number, since it is smaller than the sum of its proper divisors (2647960).

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

1998320 is a wasteful number, since it uses less digits than its factorization.

1998320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24992 (or 24986 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 1998320 is about 1413.6194678908. The cubic root of 1998320 is about 125.9568173177.

The spelling of 1998320 in words is "one million, nine hundred ninety-eight thousand, three hundred twenty".