1988280 has 128 divisors (see below), whose sum is σ = 7603200. Its totient is φ = 452736.

The previous prime is 1988279. The next prime is 1988291. The reversal of 1988280 is 828891.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7429 + ... + 7691.

It is an arithmetic number, because the mean of its divisors is an integer number (59400).

2^1988280 is an apocalyptic number.

1988280 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 1988280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3801600).

1988280 is an abundant number, since it is smaller than the sum of its proper divisors (5614920).

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

1988280 is a wasteful number, since it uses less digits than its factorization.

1988280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290 (or 280 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 1988280 is about 1410.0638283425. The cubic root of 1988280 is about 125.7455181156.

The spelling of 1988280 in words is "one million, nine hundred eighty-eight thousand, two hundred eighty".