1213220 has 12 divisors (see below), whose sum is σ = 2547804. Its totient is φ = 485280.

The previous prime is 1213213. The next prime is 1213241. The reversal of 1213220 is 223121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 306916 + 906304 = 554^2 + 952^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30311 + ... + 30350.

It is an arithmetic number, because the mean of its divisors is an integer number (212317).

2^1213220 is an apocalyptic number.

1213220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213220 is an abundant number, since it is smaller than the sum of its proper divisors (1334584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1213220 is a wasteful number, since it uses less digits than its factorization.

1213220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60670 (or 60668 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 1213220 is about 1101.4626639156. The cubic root of 1213220 is about 106.6546644482.

Adding to 1213220 its reverse (223121), we get a palindrome (1436341).

Subtracting from 1213220 its reverse (223121), we obtain a palindrome (990099).

The spelling of 1213220 in words is "one million, two hundred thirteen thousand, two hundred twenty".