1220216 has 16 divisors (see below), whose sum is σ = 2307840. Its totient is φ = 604800.

The previous prime is 1220203. The next prime is 1220239. The reversal of 1220216 is 6120221.

It is a self number, because there is not a number n which added to its sum of digits gives 1220216.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 416 + ... + 1616.

It is an arithmetic number, because the mean of its divisors is an integer number (144240).

2^1220216 is an apocalyptic number.

It is an amenable number.

1220216 is a deficient number, since it is larger than the sum of its proper divisors (1087624).

1220216 is a wasteful number, since it uses less digits than its factorization.

1220216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1334 (or 1330 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1220216 is about 1104.6338759969. The cubic root of 1220216 is about 106.8592787199.

Adding to 1220216 its reverse (6120221), we get a palindrome (7340437).

The spelling of 1220216 in words is "one million, two hundred twenty thousand, two hundred sixteen".