1989321 has 8 divisors (see below), whose sum is σ = 2660064. Its totient is φ = 1322400.

The previous prime is 1989307. The next prime is 1989329. The reversal of 1989321 is 1239891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1989321 - 2⁷ = 1989193 is a prime.

It is a Curzon number.

1989321 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1989329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 646 + ... + 2096.

It is an arithmetic number, because the mean of its divisors is an integer number (332508).

2^1989321 is an apocalyptic number.

It is an amenable number.

1989321 is a deficient number, since it is larger than the sum of its proper divisors (670743).

1989321 is a wasteful number, since it uses less digits than its factorization.

1989321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1911.

The product of its digits is 3888, while the sum is 33.

The square root of 1989321 is about 1410.4329122649. The cubic root of 1989321 is about 125.7674597345.

The spelling of 1989321 in words is "one million, nine hundred eighty-nine thousand, three hundred twenty-one".