1220220 has 36 divisors (see below), whose sum is σ = 3701880. Its totient is φ = 325344.

The previous prime is 1220203. The next prime is 1220239. The reversal of 1220220 is 220221.

1220220 = T₄₈₉ + T₄₉₀ + ... + T₄₉₈.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3210 + ... + 3569.

It is an arithmetic number, because the mean of its divisors is an integer number (102830).

2^1220220 is an apocalyptic number.

1220220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220220 is an abundant number, since it is smaller than the sum of its proper divisors (2481660).

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

1220220 is a wasteful number, since it uses less digits than its factorization.

1220220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6794 (or 6789 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 1220220 is about 1104.6356865501. The cubic root of 1220220 is about 106.8593954852.

Adding to 1220220 its reverse (220221), we get a palindrome (1440441).

Subtracting from 1220220 its reverse (220221), we obtain a palindrome (999999).

The spelling of 1220220 in words is "one million, two hundred twenty thousand, two hundred twenty".