1781222 has 8 divisors (see below), whose sum is σ = 2688336. Its totient is φ = 885112.

The previous prime is 1781203. The next prime is 1781233. The reversal of 1781222 is 2221871.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2333 + ... + 3000.

It is an arithmetic number, because the mean of its divisors is an integer number (336042).

2^1781222 is an apocalyptic number.

1781222 is a deficient number, since it is larger than the sum of its proper divisors (907114).

1781222 is a wasteful number, since it uses less digits than its factorization.

1781222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5502.

The product of its digits is 448, while the sum is 23.

The square root of 1781222 is about 1334.6242917016. The cubic root of 1781222 is about 121.2195544772.

The spelling of 1781222 in words is "one million, seven hundred eighty-one thousand, two hundred twenty-two".