1222805 has 4 divisors (see below), whose sum is σ = 1467372. Its totient is φ = 978240.

The previous prime is 1222801. The next prime is 1222811. The reversal of 1222805 is 5082221.

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

It can be written as a sum of positive squares in 2 ways, for example, as 707281 + 515524 = 841^2 + 718^2 .

It is not a de Polignac number, because 1222805 - 2² = 1222801 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222801) 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, 122276 + ... + 122285.

It is an arithmetic number, because the mean of its divisors is an integer number (366843).

2^1222805 is an apocalyptic number.

It is an amenable number.

1222805 is a deficient number, since it is larger than the sum of its proper divisors (244567).

1222805 is an equidigital number, since it uses as much as digits as its factorization.

1222805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244566.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 1222805 is about 1105.8051365408. The cubic root of 1222805 is about 106.9348017517.

The spelling of 1222805 in words is "one million, two hundred twenty-two thousand, eight hundred five".