280838 has 4 divisors (see below), whose sum is σ = 421260. Its totient is φ = 140418.

The previous prime is 280837. The next prime is 280843. The reversal of 280838 is 838082.

280838 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 280838.

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 280838.

It is not an unprimeable number, because it can be changed into a prime (280837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70208 + ... + 70211.

It is an arithmetic number, because the mean of its divisors is an integer number (105315).

2²⁸⁰⁸³⁸ is an apocalyptic number.

280838 is a deficient number, since it is larger than the sum of its proper divisors (140422).

280838 is a wasteful number, since it uses less digits than its factorization.

280838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140421.

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 280838 is about 529.9415062061. The cubic root of 280838 is about 65.4865267628.

The spelling of 280838 in words is "two hundred eighty thousand, eight hundred thirty-eight".