1988660 has 24 divisors (see below), whose sum is σ = 4422600. Its totient is φ = 748544.

The previous prime is 1988659. The next prime is 1988669. The reversal of 1988660 is 668891.

It can be written as a sum of positive squares in 4 ways, for example, as 283024 + 1705636 = 532^2 + 1306^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1988669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2585 + ... + 3264.

It is an arithmetic number, because the mean of its divisors is an integer number (184275).

2^1988660 is an apocalyptic number.

1988660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1988660 is an abundant number, since it is smaller than the sum of its proper divisors (2433940).

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

1988660 is a wasteful number, since it uses less digits than its factorization.

1988660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5875 (or 5873 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 1988660 is about 1410.1985675783. The cubic root of 1988660 is about 125.7535284316.

The spelling of 1988660 in words is "one million, nine hundred eighty-eight thousand, six hundred sixty".