1305438720 has 320 divisors, whose sum is σ = 4407575040. Its totient is φ = 329269248.

The previous prime is 1305438697. The next prime is 1305438733. The reversal of 1305438720 is 278345031.

It is a tau number, because it is divible by the number of its divisors (320).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19484127 + ... + 19484193.

It is an arithmetic number, because the mean of its divisors is an integer number (13773672).

Almost surely, 2^1305438720 is an apocalyptic number.

1305438720 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 1305438720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2203787520).

1305438720 is an abundant number, since it is smaller than the sum of its proper divisors (3102136320).

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

1305438720 is an equidigital number, since it uses as much as digits as its factorization.

1305438720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195 (or 179 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 1305438720 is about 36130.8555115984. The cubic root of 1305438720 is about 1092.9127604412.

The spelling of 1305438720 in words is "one billion, three hundred five million, four hundred thirty-eight thousand, seven hundred twenty".