1989685 has 8 divisors (see below), whose sum is σ = 2396160. Its totient is φ = 1586064.

The previous prime is 1989683. The next prime is 1989721. The reversal of 1989685 is 5869891.

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 1989685 - 2¹ = 1989683 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989683) 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, 1396 + ... + 2434.

It is an arithmetic number, because the mean of its divisors is an integer number (299520).

2^1989685 is an apocalyptic number.

It is an amenable number.

1989685 is a deficient number, since it is larger than the sum of its proper divisors (406475).

1989685 is a wasteful number, since it uses less digits than its factorization.

1989685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1427.

The product of its digits is 155520, while the sum is 46.

The square root of 1989685 is about 1410.5619447582. The cubic root of 1989685 is about 125.7751301177.

The spelling of 1989685 in words is "one million, nine hundred eighty-nine thousand, six hundred eighty-five".