1223805 has 16 divisors (see below), whose sum is σ = 2136384. Its totient is φ = 593280.

The previous prime is 1223777. The next prime is 1223857. The reversal of 1223805 is 5083221.

It is not a de Polignac number, because 1223805 - 2⁵ = 1223773 is a prime.

It is a Curzon number.

1223805 is a lucky number.

It is a nialpdrome in base 11.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3544 + ... + 3873.

It is an arithmetic number, because the mean of its divisors is an integer number (133524).

2^1223805 is an apocalyptic number.

1223805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1223805 is a deficient number, since it is larger than the sum of its proper divisors (912579).

1223805 is a wasteful number, since it uses less digits than its factorization.

1223805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7436.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1223805 is about 1106.2572033664. The cubic root of 1223805 is about 106.9639439466.

The spelling of 1223805 in words is "one million, two hundred twenty-three thousand, eight hundred five".