989805 has 32 divisors (see below), whose sum is σ = 1751040. Its totient is φ = 475200.

The previous prime is 989803. The next prime is 989827. The reversal of 989805 is 508989.

It is not a de Polignac number, because 989805 - 2¹ = 989803 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989803) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6480 + ... + 6630.

It is an arithmetic number, because the mean of its divisors is an integer number (54720).

2⁹⁸⁹⁸⁰⁵ is an apocalyptic number.

989805 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

It is an amenable number.

989805 is a deficient number, since it is larger than the sum of its proper divisors (761235).

989805 is a wasteful number, since it uses less digits than its factorization.

989805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201.

The product of its (nonzero) digits is 25920, while the sum is 39.

The square root of 989805 is about 994.8894410938. The cubic root of 989805 is about 99.6590052139.

The spelling of 989805 in words is "nine hundred eighty-nine thousand, eight hundred five".