1305840980 has 24 divisors (see below), whose sum is σ = 2809152360. Its totient is φ = 509596160.

The previous prime is 1305840961. The next prime is 1305840989. The reversal of 1305840980 is 890485031.

It can be written as a sum of positive squares in 4 ways, for example, as 25060036 + 1280780944 = 5006^2 + 35788^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1305840989) 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, 795425 + ... + 797064.

It is an arithmetic number, because the mean of its divisors is an integer number (117048015).

Almost surely, 2^1305840980 is an apocalyptic number.

1305840980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1305840980 is an abundant number, since it is smaller than the sum of its proper divisors (1503311380).

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

1305840980 is a wasteful number, since it uses less digits than its factorization.

1305840980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1592539 (or 1592537 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 1305840980 is about 36136.4217929778. The cubic root of 1305840980 is about 1093.0250062151.

The spelling of 1305840980 in words is "one billion, three hundred five million, eight hundred forty thousand, nine hundred eighty".