1089689 has 4 divisors (see below), whose sum is σ = 1100580. Its totient is φ = 1078800.

The previous prime is 1089679. The next prime is 1089703. The reversal of 1089689 is 9869801.

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 824464 + 265225 = 908^2 + 515^2 .

It is a cyclic number.

It is not a de Polignac number, because 1089689 - 2²⁰ = 41113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1089629) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5294 + ... + 5495.

It is an arithmetic number, because the mean of its divisors is an integer number (275145).

2^1089689 is an apocalyptic number.

It is an amenable number.

1089689 is a deficient number, since it is larger than the sum of its proper divisors (10891).

1089689 is a wasteful number, since it uses less digits than its factorization.

1089689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10890.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 1089689 is about 1043.8816982781. The cubic root of 1089689 is about 102.9044578574.

The spelling of 1089689 in words is "one million, eighty-nine thousand, six hundred eighty-nine".