1304144220 has 24 divisors (see below), whose sum is σ = 3651603984. Its totient is φ = 347771776.

The previous prime is 1304144209. The next prime is 1304144227. The reversal of 1304144220 is 224414031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1304144227) 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, 10867809 + ... + 10867928.

It is an arithmetic number, because the mean of its divisors is an integer number (152150166).

Almost surely, 2^1304144220 is an apocalyptic number.

1304144220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1304144220 is an abundant number, since it is smaller than the sum of its proper divisors (2347459764).

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

1304144220 is a wasteful number, since it uses less digits than its factorization.

1304144220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21735749 (or 21735747 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 1304144220 is about 36112.9370170857. The cubic root of 1304144220 is about 1092.5513893444.

Adding to 1304144220 its reverse (224414031), we get a palindrome (1528558251).

The spelling of 1304144220 in words is "one billion, three hundred four million, one hundred forty-four thousand, two hundred twenty".