1223806 has 4 divisors (see below), whose sum is σ = 1835712. Its totient is φ = 611902.

The previous prime is 1223777. The next prime is 1223857. The reversal of 1223806 is 6083221.

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

It is a super-2 number, since 2×1223806² = 2995402251272, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 as a sum of consecutive naturals, namely, 305950 + ... + 305953.

It is an arithmetic number, because the mean of its divisors is an integer number (458928).

2^1223806 is an apocalyptic number.

1223806 is a deficient number, since it is larger than the sum of its proper divisors (611906).

1223806 is an equidigital number, since it uses as much as digits as its factorization.

1223806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611905.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 1223806 is about 1106.2576553407. The cubic root of 1223806 is about 106.9639730809.

The spelling of 1223806 in words is "one million, two hundred twenty-three thousand, eight hundred six".