1220856 has 96 divisors (see below), whose sum is σ = 3864960. Its totient is φ = 314496.

The previous prime is 1220839. The next prime is 1220893. The reversal of 1220856 is 6580221.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a zygodrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28371 + ... + 28413.

It is an arithmetic number, because the mean of its divisors is an integer number (40260).

2^1220856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1932480).

1220856 is an abundant number, since it is smaller than the sum of its proper divisors (2644104).

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

1220856 is a wasteful number, since it uses less digits than its factorization.

1220856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85 (or 68 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 1220856 is about 1104.9235267655. The cubic root of 1220856 is about 106.8779579223.

The spelling of 1220856 in words is "one million, two hundred twenty thousand, eight hundred fifty-six".