1227220 has 24 divisors (see below), whose sum is σ = 2638944. Its totient is φ = 479136.

The previous prime is 1227181. The next prime is 1227241. The reversal of 1227220 is 227221.

1227220 = 279² + 280² + ... + 293².

It is a junction number, because it is equal to n+sod(n) for n = 1227194 and 1227203.

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 7 ways as a sum of consecutive naturals, for example, 147 + ... + 1573.

It is an arithmetic number, because the mean of its divisors is an integer number (109956).

2^1227220 is an apocalyptic number.

1227220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1227220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1319472).

1227220 is an abundant number, since it is smaller than the sum of its proper divisors (1411724).

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

1227220 is a wasteful number, since it uses less digits than its factorization.

1227220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1479 (or 1477 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 1227220 is about 1107.7996208701. The cubic root of 1227220 is about 107.0633450288.

Subtracting from 1227220 its reverse (227221), we obtain a palindrome (999999).

The spelling of 1227220 in words is "one million, two hundred twenty-seven thousand, two hundred twenty".