280434 has 32 divisors (see below), whose sum is σ = 700416. Its totient is φ = 72720.

The previous prime is 280411. The next prime is 280451. The reversal of 280434 is 434082.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 280434.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 280434.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159 + ... + 765.

It is an arithmetic number, because the mean of its divisors is an integer number (21888).

2²⁸⁰⁴³⁴ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 280434, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (350208).

280434 is an abundant number, since it is smaller than the sum of its proper divisors (419982).

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

280434 is a wasteful number, since it uses less digits than its factorization.

280434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 280434 is about 529.5601948787. The cubic root of 280434 is about 65.4551097735.

The spelling of 280434 in words is "two hundred eighty thousand, four hundred thirty-four".