1305545980 has 24 divisors (see below), whose sum is σ = 2743160112. Its totient is φ = 521930112.

The previous prime is 1305545959. The next prime is 1305545981. The reversal of 1305545980 is 895455031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1305545981) 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, 21199 + ... + 55321.

It is an arithmetic number, because the mean of its divisors is an integer number (114298338).

Almost surely, 2^1305545980 is an apocalyptic number.

1305545980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1305545980 is an abundant number, since it is smaller than the sum of its proper divisors (1437614132).

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

1305545980 is a wasteful number, since it uses less digits than its factorization.

1305545980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36045 (or 36043 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 40.

The square root of 1305545980 is about 36132.3398079892. The cubic root of 1305545980 is about 1092.9426922975.

The spelling of 1305545980 in words is "one billion, three hundred five million, five hundred forty-five thousand, nine hundred eighty".