1989373 has 4 divisors (see below), whose sum is σ = 2009980. Its totient is φ = 1968768.

The previous prime is 1989353. The next prime is 1989401. The reversal of 1989373 is 3739891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 636804 + 1352569 = 798^2 + 1163^2 .

It is a cyclic number.

It is not a de Polignac number, because 1989373 - 2⁵ = 1989341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989353) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10158 + ... + 10351.

It is an arithmetic number, because the mean of its divisors is an integer number (502495).

2^1989373 is an apocalyptic number.

It is an amenable number.

1989373 is a deficient number, since it is larger than the sum of its proper divisors (20607).

1989373 is an equidigital number, since it uses as much as digits as its factorization.

1989373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20606.

The product of its digits is 40824, while the sum is 40.

The square root of 1989373 is about 1410.4513462009. The cubic root of 1989373 is about 125.7685555608.

The spelling of 1989373 in words is "one million, nine hundred eighty-nine thousand, three hundred seventy-three".