1780222 has 4 divisors (see below), whose sum is σ = 2670336. Its totient is φ = 890110.

The previous prime is 1780201. The next prime is 1780231. The reversal of 1780222 is 2220871.

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

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 plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 1780193 and 1780202.

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, 445054 + ... + 445057.

It is an arithmetic number, because the mean of its divisors is an integer number (667584).

2^1780222 is an apocalyptic number.

1780222 is a deficient number, since it is larger than the sum of its proper divisors (890114).

1780222 is an equidigital number, since it uses as much as digits as its factorization.

1780222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890113.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 1780222 is about 1334.2496018362. The cubic root of 1780222 is about 121.1968655131.

It can be divided in two parts, 1780 and 222, that added together give a palindrome (2002).

The spelling of 1780222 in words is "one million, seven hundred eighty thousand, two hundred twenty-two".