1226220 has 48 divisors (see below), whose sum is σ = 3483648. Its totient is φ = 322240.

The previous prime is 1226213. The next prime is 1226237. The reversal of 1226220 is 226221.

1226220 = 388² + 389² + ... + 395².

1226220 is nontrivially palindromic in base 14.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1226220.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6325 + ... + 6515.

It is an arithmetic number, because the mean of its divisors is an integer number (72576).

2^1226220 is an apocalyptic number.

1226220 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 1226220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1741824).

1226220 is an abundant number, since it is smaller than the sum of its proper divisors (2257428).

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

1226220 is a wasteful number, since it uses less digits than its factorization.

1226220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310 (or 308 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 1226220 is about 1107.3481837254. The cubic root of 1226220 is about 107.0342569440.

Subtracting from 1226220 its reverse (226221), we obtain a palindrome (999999).

The spelling of 1226220 in words is "one million, two hundred twenty-six thousand, two hundred twenty".