280940 has 24 divisors (see below), whose sum is σ = 644112. Its totient is φ = 102080.

The previous prime is 280939. The next prime is 280949. The reversal of 280940 is 49082.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 280940.

It is not an unprimeable number, because it can be changed into a prime (280949) 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, 419 + ... + 858.

It is an arithmetic number, because the mean of its divisors is an integer number (26838).

2²⁸⁰⁹⁴⁰ is an apocalyptic number.

280940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

280940 is an abundant number, since it is smaller than the sum of its proper divisors (363172).

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

280940 is a wasteful number, since it uses less digits than its factorization.

280940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1297 (or 1295 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 280940 is about 530.0377345058. The cubic root of 280940 is about 65.4944540105.

The spelling of 280940 in words is "two hundred eighty thousand, nine hundred forty".