1089823 has 4 divisors (see below), whose sum is σ = 1245520. Its totient is φ = 934128.

The previous prime is 1089799. The next prime is 1089841. The reversal of 1089823 is 3289801.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3289801 = 43 ⋅76507.

It is a cyclic number.

It is not a de Polignac number, because 1089823 - 2¹³ = 1081631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1089863) 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, 77838 + ... + 77851.

It is an arithmetic number, because the mean of its divisors is an integer number (311380).

2^1089823 is an apocalyptic number.

1089823 is a deficient number, since it is larger than the sum of its proper divisors (155697).

1089823 is an equidigital number, since it uses as much as digits as its factorization.

1089823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155696.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 1089823 is about 1043.9458798233. The cubic root of 1089823 is about 102.9086757679.

The spelling of 1089823 in words is "one million, eighty-nine thousand, eight hundred twenty-three".