1821226 has 16 divisors (see below), whose sum is σ = 3137760. Its totient is φ = 784080.

The previous prime is 1821191. The next prime is 1821233. The reversal of 1821226 is 6221281.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1821197 and 1821206.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1761 + ... + 2596.

It is an arithmetic number, because the mean of its divisors is an integer number (196110).

2^1821226 is an apocalyptic number.

1821226 is a deficient number, since it is larger than the sum of its proper divisors (1316534).

1821226 is a wasteful number, since it uses less digits than its factorization.

1821226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4389.

The product of its digits is 384, while the sum is 22.

The square root of 1821226 is about 1349.5280656585. The cubic root of 1821226 is about 122.1203238237.

The spelling of 1821226 in words is "one million, eight hundred twenty-one thousand, two hundred twenty-six".