1304220 has 24 divisors (see below), whose sum is σ = 3651984. Its totient is φ = 347776.

The previous prime is 1304209. The next prime is 1304221. The reversal of 1304220 is 224031.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1304196 and 1304205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1304221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10809 + ... + 10928.

It is an arithmetic number, because the mean of its divisors is an integer number (152166).

2^1304220 is an apocalyptic number.

1304220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1304220 is an abundant number, since it is smaller than the sum of its proper divisors (2347764).

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

1304220 is a wasteful number, since it uses less digits than its factorization.

1304220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21749 (or 21747 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 1304220 is about 1142.0245181256. The cubic root of 1304220 is about 109.2572550588.

Adding to 1304220 its reverse (224031), we get a palindrome (1528251).

The spelling of 1304220 in words is "one million, three hundred four thousand, two hundred twenty".