1222845 has 16 divisors (see below), whose sum is σ = 2107392. Its totient is φ = 601920.

The previous prime is 1222831. The next prime is 1222847. The reversal of 1222845 is 5482221.

It is not a de Polignac number, because 1222845 - 2⁴ = 1222829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222847) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2941 + ... + 3330.

It is an arithmetic number, because the mean of its divisors is an integer number (131712).

2^1222845 is an apocalyptic number.

1222845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1222845 is a deficient number, since it is larger than the sum of its proper divisors (884547).

1222845 is a wasteful number, since it uses less digits than its factorization.

1222845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6292.

The product of its digits is 1280, while the sum is 24.

The square root of 1222845 is about 1105.8232227621. The cubic root of 1222845 is about 106.9359677445.

The spelling of 1222845 in words is "one million, two hundred twenty-two thousand, eight hundred forty-five".