1988388 has 90 divisors (see below), whose sum is σ = 5808726. Its totient is φ = 590976.

The previous prime is 1988353. The next prime is 1988411. The reversal of 1988388 is 8838891.

It can be written as a sum of positive squares in only one way, i.e., 1871424 + 116964 = 1368^2 + 342^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 104643 + ... + 104661.

2^1988388 is an apocalyptic number.

1988388 is a gapful number since it is divisible by the number (18) 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 1988388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2904363).

1988388 is an abundant number, since it is smaller than the sum of its proper divisors (3820338).

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

1988388 is a wasteful number, since it uses less digits than its factorization.

1988388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71 (or 41 counting only the distinct ones).

The product of its digits is 110592, while the sum is 45.

The square root of 1988388 is about 1410.1021239612. The cubic root of 1988388 is about 125.7477948356.

The spelling of 1988388 in words is "one million, nine hundred eighty-eight thousand, three hundred eighty-eight".