1220550 has 48 divisors (see below), whose sum is σ = 3095040. Its totient is φ = 318240.

The previous prime is 1220507. The next prime is 1220591. The reversal of 1220550 is 550221.

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

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, 11799 + ... + 11901.

It is an arithmetic number, because the mean of its divisors is an integer number (64480).

2^1220550 is an apocalyptic number.

1220550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1547520).

1220550 is an abundant number, since it is smaller than the sum of its proper divisors (1874490).

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

1220550 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (1220549) it forms an eRAP, since the sums of their prime factors are consecutive (196 and 197).

1220550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197 (or 192 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 1220550 is about 1104.7850469662. The cubic root of 1220550 is about 106.8690277433.

Adding to 1220550 its reverse (550221), we get a palindrome (1770771).

It can be divided in two parts, 1220 and 550, that added together give a triangular number (1770 = T₅₉).

The spelling of 1220550 in words is "one million, two hundred twenty thousand, five hundred fifty".