1989396 has 36 divisors (see below), whose sum is σ = 5104372. Its totient is φ = 653184.

The previous prime is 1989353. The next prime is 1989401. The reversal of 1989396 is 6939891.

It can be written as a sum of positive squares in 2 ways, for example, as 1179396 + 810000 = 1086^2 + 900^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 2250 + ... + 3006.

2^1989396 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1989396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2552186).

1989396 is an abundant number, since it is smaller than the sum of its proper divisors (3114976).

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

1989396 is a wasteful number, since it uses less digits than its factorization.

1989396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840 (or 835 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 1989396 is about 1410.4594995958. The cubic root of 1989396 is about 125.7690402471.

The spelling of 1989396 in words is "one million, nine hundred eighty-nine thousand, three hundred ninety-six".