1989385 has 8 divisors (see below), whose sum is σ = 2491200. Its totient is φ = 1522224.

The previous prime is 1989353. The next prime is 1989401. The reversal of 1989385 is 5839891.

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

It is a cyclic number.

It is not a de Polignac number, because 1989385 - 2⁵ = 1989353 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 8535 + ... + 8764.

It is an arithmetic number, because the mean of its divisors is an integer number (311400).

2^1989385 is an apocalyptic number.

It is an amenable number.

1989385 is a deficient number, since it is larger than the sum of its proper divisors (501815).

1989385 is a wasteful number, since it uses less digits than its factorization.

1989385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17327.

The product of its digits is 77760, while the sum is 43.

The square root of 1989385 is about 1410.4556001520. The cubic root of 1989385 is about 125.7688084411.

The spelling of 1989385 in words is "one million, nine hundred eighty-nine thousand, three hundred eighty-five".