1089845 has 4 divisors (see below), whose sum is σ = 1307820. Its totient is φ = 871872.

The previous prime is 1089841. The next prime is 1089863. The reversal of 1089845 is 5489801.

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 749956 + 339889 = 866^2 + 583^2 .

It is a cyclic number.

It is not a de Polignac number, because 1089845 - 2² = 1089841 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1089841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108980 + ... + 108989.

It is an arithmetic number, because the mean of its divisors is an integer number (326955).

2^1089845 is an apocalyptic number.

It is an amenable number.

1089845 is a deficient number, since it is larger than the sum of its proper divisors (217975).

1089845 is an equidigital number, since it uses as much as digits as its factorization.

1089845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217974.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 1089845 is about 1043.9564167148. The cubic root of 1089845 is about 102.9093682277.

The spelling of 1089845 in words is "one million, eighty-nine thousand, eight hundred forty-five".