1989188 has 6 divisors (see below), whose sum is σ = 3481086. Its totient is φ = 994592.

The previous prime is 1989161. The next prime is 1989193. The reversal of 1989188 is 8819891.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1982464 + 6724 = 1408^2 + 82^2 .

It is a plaindrome in base 14.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 248645 + ... + 248652.

It is an arithmetic number, because the mean of its divisors is an integer number (580181).

2^1989188 is an apocalyptic number.

It is an amenable number.

1989188 is a deficient number, since it is larger than the sum of its proper divisors (1491898).

1989188 is a wasteful number, since it uses less digits than its factorization.

1989188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497301 (or 497299 counting only the distinct ones).

The product of its digits is 41472, while the sum is 44.

The square root of 1989188 is about 1410.3857628323. The cubic root of 1989188 is about 125.7646568611.

The spelling of 1989188 in words is "one million, nine hundred eighty-nine thousand, one hundred eighty-eight".