1001220 has 96 divisors (see below), whose sum is σ = 3217536. Its totient is φ = 230400.

The previous prime is 1001219. The next prime is 1001237. The reversal of 1001220 is 221001.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (6).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a junction number, because it is equal to n+sod(n) for n = 1001199 and 1001208.

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, 24400 + ... + 24440.

It is an arithmetic number, because the mean of its divisors is an integer number (33516).

2^1001220 is an apocalyptic number.

1001220 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 1001220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1608768).

1001220 is an abundant number, since it is smaller than the sum of its proper divisors (2216316).

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

1001220 is a wasteful number, since it uses less digits than its factorization.

1001220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101 (or 99 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 1001220 is about 1000.6098140634. The cubic root of 1001220 is about 100.0406501401.

Adding to 1001220 its reverse (221001), we get a palindrome (1222221).

It can be divided in two parts, 1001 and 220, that added together give a palindrome (1221).

The spelling of 1001220 in words is "one million, one thousand, two hundred twenty".