1989941 has 4 divisors (see below), whose sum is σ = 1999584. Its totient is φ = 1980300.

The previous prime is 1989919. The next prime is 1989947. The reversal of 1989941 is 1499891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1989941 - 2⁶ = 1989877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4505 + ... + 4926.

It is an arithmetic number, because the mean of its divisors is an integer number (499896).

2^1989941 is an apocalyptic number.

It is an amenable number.

1989941 is a deficient number, since it is larger than the sum of its proper divisors (9643).

1989941 is an equidigital number, since it uses as much as digits as its factorization.

1989941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9642.

The product of its digits is 23328, while the sum is 41.

The square root of 1989941 is about 1410.6526858160. The cubic root of 1989941 is about 125.7805241127.

The spelling of 1989941 in words is "one million, nine hundred eighty-nine thousand, nine hundred forty-one".