280432 has 20 divisors (see below), whose sum is σ = 575856. Its totient is φ = 131840.

The previous prime is 280411. The next prime is 280451. The reversal of 280432 is 234082.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244 + ... + 787.

2²⁸⁰⁴³² is an apocalyptic number.

It is an amenable number.

280432 is an abundant number, since it is smaller than the sum of its proper divisors (295424).

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

280432 is a wasteful number, since it uses less digits than its factorization.

280432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056 (or 1050 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 280432 is about 529.5583065159. The cubic root of 280432 is about 65.4549541688.

The spelling of 280432 in words is "two hundred eighty thousand, four hundred thirty-two".