1009823 has 4 divisors (see below), whose sum is σ = 1011840. Its totient is φ = 1007808.

The previous prime is 1009819. The next prime is 1009837. The reversal of 1009823 is 3289001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1009823 - 2² = 1009819 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 (1009843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 386 + ... + 1472.

It is an arithmetic number, because the mean of its divisors is an integer number (252960).

2^1009823 is an apocalyptic number.

1009823 is a deficient number, since it is larger than the sum of its proper divisors (2017).

1009823 is an equidigital number, since it uses as much as digits as its factorization.

1009823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2016.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1009823 is about 1004.8994974623. The cubic root of 1009823 is about 100.3263670202.

The spelling of 1009823 in words is "one million, nine thousand, eight hundred twenty-three".