1222620 has 96 divisors (see below), whose sum is σ = 4064256. Its totient is φ = 268800.

The previous prime is 1222603. The next prime is 1222633. The reversal of 1222620 is 262221.

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 1222620.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17185 + ... + 17255.

It is an arithmetic number, because the mean of its divisors is an integer number (42336).

2^1222620 is an apocalyptic number.

1222620 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 1222620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2032128).

1222620 is an abundant number, since it is smaller than the sum of its proper divisors (2841636).

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

1222620 is a wasteful number, since it uses less digits than its factorization.

1222620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131 (or 129 counting only the distinct ones).

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

The square root of 1222620 is about 1105.7214839190. The cubic root of 1222620 is about 106.9294087043.

Adding to 1222620 its reverse (262221), we get a palindrome (1484841).

It can be divided in two parts, 12226 and 20, that added together give a triangular number (12246 = T₁₅₆).

The spelling of 1222620 in words is "one million, two hundred twenty-two thousand, six hundred twenty".