989685 has 16 divisors (see below), whose sum is σ = 1759680. Its totient is φ = 527760.

The previous prime is 989671. The next prime is 989687. The reversal of 989685 is 586989.

It is not a de Polignac number, because 989685 - 2⁷ = 989557 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 989685.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3531 + ... + 3800.

It is an arithmetic number, because the mean of its divisors is an integer number (109980).

2⁹⁸⁹⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

989685 is a deficient number, since it is larger than the sum of its proper divisors (769995).

989685 is a wasteful number, since it uses less digits than its factorization.

989685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7345 (or 7339 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 989685 is about 994.8291310572. The cubic root of 989685 is about 99.6549776314.

The spelling of 989685 in words is "nine hundred eighty-nine thousand, six hundred eighty-five".