305980 has 12 divisors (see below), whose sum is σ = 642600. Its totient is φ = 122384.

The previous prime is 305971. The next prime is 305999. The reversal of 305980 is 89503.

It is a congruent number.

It is an unprimeable number.

305980 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7630 + ... + 7669.

It is an arithmetic number, because the mean of its divisors is an integer number (53550).

2³⁰⁵⁹⁸⁰ is an apocalyptic number.

It is an amenable number.

305980 is an abundant number, since it is smaller than the sum of its proper divisors (336620).

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

305980 is a wasteful number, since it uses less digits than its factorization.

305980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15308 (or 15306 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 305980 is about 553.1545896040. The cubic root of 305980 is about 67.3851728575.

The spelling of 305980 in words is "three hundred five thousand, nine hundred eighty".