989605 has 4 divisors (see below), whose sum is σ = 1187532. Its totient is φ = 791680.

The previous prime is 989581. The next prime is 989623. The reversal of 989605 is 506989.

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 213444 + 776161 = 462^2 + 881^2 .

It is not a de Polignac number, because 989605 - 2⁷ = 989477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98956 + ... + 98965.

It is an arithmetic number, because the mean of its divisors is an integer number (296883).

2⁹⁸⁹⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

989605 is a deficient number, since it is larger than the sum of its proper divisors (197927).

989605 is a wasteful number, since it uses less digits than its factorization.

989605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197926.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 989605 is about 994.7889223348. The cubic root of 989605 is about 99.6522923955.

The spelling of 989605 in words is "nine hundred eighty-nine thousand, six hundred five".