1304143220 has 24 divisors (see below), whose sum is σ = 2739786504. Its totient is φ = 521450496.

The previous prime is 1304143213. The next prime is 1304143229. The reversal of 1304143220 is 223414031.

It can be written as a sum of positive squares in 4 ways, for example, as 101163364 + 1202979856 = 10058^2 + 34684^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1304143192 and 1304143201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1304143229) 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, 45152 + ... + 68168.

It is an arithmetic number, because the mean of its divisors is an integer number (114157771).

Almost surely, 2^1304143220 is an apocalyptic number.

1304143220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1304143220 is an abundant number, since it is smaller than the sum of its proper divisors (1435643284).

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

1304143220 is a wasteful number, since it uses less digits than its factorization.

1304143220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25859 (or 25857 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 1304143220 is about 36112.9231716293. The cubic root of 1304143220 is about 1092.5511100931.

Adding to 1304143220 its reverse (223414031), we get a palindrome (1527557251).

The spelling of 1304143220 in words is "one billion, three hundred four million, one hundred forty-three thousand, two hundred twenty".