1989841 has 6 divisors (see below), whose sum is σ = 2314770. Its totient is φ = 1705536.

The previous prime is 1989811. The next prime is 1989847. The reversal of 1989841 is 1489891.

It can be written as a sum of positive squares in only one way, i.e., 1449616 + 540225 = 1204^2 + 735^2 .

It is not a de Polignac number, because 1989841 - 2⁹ = 1989329 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1989794 and 1989803.

It is not an unprimeable number, because it can be changed into a prime (1989847) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20256 + ... + 20353.

It is an arithmetic number, because the mean of its divisors is an integer number (385795).

2^1989841 is an apocalyptic number.

It is an amenable number.

1989841 is a deficient number, since it is larger than the sum of its proper divisors (324929).

1989841 is an equidigital number, since it uses as much as digits as its factorization.

1989841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40623 (or 40616 counting only the distinct ones).

The product of its digits is 20736, while the sum is 40.

The square root of 1989841 is about 1410.6172407850. The cubic root of 1989841 is about 125.7784171385.

The spelling of 1989841 in words is "one million, nine hundred eighty-nine thousand, eight hundred forty-one".