1988784 has 60 divisors (see below), whose sum is σ = 6364176. Its totient is φ = 567936.

The previous prime is 1988759. The next prime is 1988797. The reversal of 1988784 is 4878891.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22 + ... + 1994.

2^1988784 is an apocalyptic number.

1988784 is a gapful number since it is divisible by the number (14) 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 1988784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3182088).

1988784 is an abundant number, since it is smaller than the sum of its proper divisors (4375392).

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

1988784 is a wasteful number, since it uses less digits than its factorization.

1988784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1994 (or 1985 counting only the distinct ones).

The product of its digits is 129024, while the sum is 45.

The square root of 1988784 is about 1410.2425323326. The cubic root of 1988784 is about 125.7561421034.

It can be divided in two parts, 1988 and 784, that added together give a palindrome (2772).

The spelling of 1988784 in words is "one million, nine hundred eighty-eight thousand, seven hundred eighty-four".