1304433220 has 48 divisors (see below), whose sum is σ = 2891528640. Its totient is φ = 492932736.

The previous prime is 1304433203. The next prime is 1304433233. The reversal of 1304433220 is 223344031.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1304433191 and 1304433200.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137139 + ... + 146341.

It is an arithmetic number, because the mean of its divisors is an integer number (60240180).

Almost surely, 2^1304433220 is an apocalyptic number.

1304433220 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 1304433220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1445764320).

1304433220 is an abundant number, since it is smaller than the sum of its proper divisors (1587095420).

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

1304433220 is a wasteful number, since it uses less digits than its factorization.

1304433220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9604 (or 9602 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 22.

The square root of 1304433220 is about 36116.9381315748. The cubic root of 1304433220 is about 1092.6320869713.

Adding to 1304433220 its reverse (223344031), we get a palindrome (1527777251).

It can be divided in two parts, 13044 and 33220, that added together give a palindrome (46264).

The spelling of 1304433220 in words is "one billion, three hundred four million, four hundred thirty-three thousand, two hundred twenty".