989689 has 4 divisors (see below), whose sum is σ = 1047924. Its totient is φ = 931456.

The previous prime is 989687. The next prime is 989719. The reversal of 989689 is 986989.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 705600 + 284089 = 840^2 + 533^2 .

It is a cyclic number.

It is not a de Polignac number, because 989689 - 2¹ = 989687 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 29092 + ... + 29125.

It is an arithmetic number, because the mean of its divisors is an integer number (261981).

2⁹⁸⁹⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

989689 is a deficient number, since it is larger than the sum of its proper divisors (58235).

989689 is a wasteful number, since it uses less digits than its factorization.

989689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58234.

The product of its digits is 279936, while the sum is 49.

The square root of 989689 is about 994.8311414506. The cubic root of 989689 is about 99.6551118894.

It can be divided in two parts, 9 and 89689, that added together give a palindrome (89698).

The spelling of 989689 in words is "nine hundred eighty-nine thousand, six hundred eighty-nine".