1004220 has 72 divisors (see below), whose sum is σ = 3485664. Its totient is φ = 229248.

The previous prime is 1004209. The next prime is 1004221. The reversal of 1004220 is 224001.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1004221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 862 + ... + 1658.

It is an arithmetic number, because the mean of its divisors is an integer number (48412).

2^1004220 is an apocalyptic number.

1004220 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 1004220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1742832).

1004220 is an abundant number, since it is smaller than the sum of its proper divisors (2481444).

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

1004220 is a wasteful number, since it uses less digits than its factorization.

1004220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819 (or 814 counting only the distinct ones).

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

The square root of 1004220 is about 1002.1077786346. The cubic root of 1004220 is about 100.1404692582.

Adding to 1004220 its reverse (224001), we get a palindrome (1228221).

The spelling of 1004220 in words is "one million, four thousand, two hundred twenty".