280424 has 8 divisors (see below), whose sum is σ = 525810. Its totient is φ = 140208.

The previous prime is 280411. The next prime is 280451. The reversal of 280424 is 424082.

It can be written as a sum of positive squares in only one way, i.e., 268324 + 12100 = 518^2 + 110^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 280396 and 280405.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 280424.

It is an unprimeable number.

280424 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 as a sum of consecutive naturals, namely, 17519 + ... + 17534.

2²⁸⁰⁴²⁴ is an apocalyptic number.

It is an amenable number.

280424 is a deficient number, since it is larger than the sum of its proper divisors (245386).

280424 is a wasteful number, since it uses less digits than its factorization.

280424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35059 (or 35055 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 280424 is about 529.5507529973. The cubic root of 280424 is about 65.4543317427.

The spelling of 280424 in words is "two hundred eighty thousand, four hundred twenty-four".