1989566 has 16 divisors (see below), whose sum is σ = 3220560. Its totient is φ = 918720.

The previous prime is 1989563. The next prime is 1989571. The reversal of 1989566 is 6659891.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989563) 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, 920 + ... + 2196.

It is an arithmetic number, because the mean of its divisors is an integer number (201285).

2^1989566 is an apocalyptic number.

1989566 is a deficient number, since it is larger than the sum of its proper divisors (1230994).

1989566 is a wasteful number, since it uses less digits than its factorization.

1989566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1339.

The product of its digits is 116640, while the sum is 44.

The square root of 1989566 is about 1410.5197623571. The cubic root of 1989566 is about 125.7726225954.

The spelling of 1989566 in words is "one million, nine hundred eighty-nine thousand, five hundred sixty-six".