1989445 has 8 divisors (see below), whose sum is σ = 2411136. Its totient is φ = 1575696.

The previous prime is 1989419. The next prime is 1989479. The reversal of 1989445 is 5449891.

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 1989445 - 2⁵ = 1989413 is a prime.

It is a Duffinian number.

1989445 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1989398 and 1989407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1417 + ... + 2446.

It is an arithmetic number, because the mean of its divisors is an integer number (301392).

2^1989445 is an apocalyptic number.

It is an amenable number.

1989445 is a deficient number, since it is larger than the sum of its proper divisors (421691).

1989445 is a wasteful number, since it uses less digits than its factorization.

1989445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3971.

The product of its digits is 51840, while the sum is 40.

The square root of 1989445 is about 1410.4768697146. The cubic root of 1989445 is about 125.7700728273.

The spelling of 1989445 in words is "one million, nine hundred eighty-nine thousand, four hundred forty-five".