280420 has 24 divisors (see below), whose sum is σ = 673344. Its totient is φ = 96096.

The previous prime is 280411. The next prime is 280451. The reversal of 280420 is 24082.

280420 is a modest number, since divided by 420 gives 280 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 280394 and 280403.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 862 + ... + 1141.

It is an arithmetic number, because the mean of its divisors is an integer number (28056).

2²⁸⁰⁴²⁰ is an apocalyptic number.

280420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

280420 is an abundant number, since it is smaller than the sum of its proper divisors (392924).

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

280420 is a wasteful number, since it uses less digits than its factorization.

280420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2019 (or 2017 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 280420 is about 529.5469761976. The cubic root of 280420 is about 65.4540205252.

The spelling of 280420 in words is "two hundred eighty thousand, four hundred twenty".