1089985 has 16 divisors (see below), whose sum is σ = 1446480. Its totient is φ = 783360.

The previous prime is 1089967. The next prime is 1090003. The reversal of 1089985 is 5899801.

It is an interprime number because it is at equal distance from previous prime (1089967) and next prime (1090003).

It can be written as a sum of positive squares in 8 ways, for example, as 97969 + 992016 = 313^2 + 996^2 .

It is not a de Polignac number, because 1089985 - 2¹¹ = 1087937 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2461 + ... + 2869.

It is an arithmetic number, because the mean of its divisors is an integer number (90405).

2^1089985 is an apocalyptic number.

It is an amenable number.

1089985 is a deficient number, since it is larger than the sum of its proper divisors (356495).

1089985 is a wasteful number, since it uses less digits than its factorization.

1089985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468.

The product of its (nonzero) digits is 25920, while the sum is 40.

The square root of 1089985 is about 1044.0234671692. The cubic root of 1089985 is about 102.9137745713.

The spelling of 1089985 in words is "one million, eighty-nine thousand, nine hundred eighty-five".