1224220 has 12 divisors (see below), whose sum is σ = 2570904. Its totient is φ = 489680.

The previous prime is 1224217. The next prime is 1224229. The reversal of 1224220 is 224221.

It is a self number, because there is not a number n which added to its sum of digits gives 1224220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1224229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30586 + ... + 30625.

It is an arithmetic number, because the mean of its divisors is an integer number (214242).

2^1224220 is an apocalyptic number.

1224220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1224220 is an abundant number, since it is smaller than the sum of its proper divisors (1346684).

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

1224220 is a wasteful number, since it uses less digits than its factorization.

1224220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61220 (or 61218 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 1224220 is about 1106.4447568677. Note that the first 3 decimals coincide. The cubic root of 1224220 is about 106.9760332964.

Adding to 1224220 its reverse (224221), we get a palindrome (1448441).

Subtracting from 1224220 its reverse (224221), we obtain a palindrome (999999).

It can be divided in two parts, 1224 and 220, that added together give a square (1444 = 38²).

The spelling of 1224220 in words is "one million, two hundred twenty-four thousand, two hundred twenty".