280239 has 8 divisors (see below), whose sum is σ = 377520. Its totient is φ = 184896.

The previous prime is 280229. The next prime is 280243. The reversal of 280239 is 932082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 280239 - 2⁴ = 280223 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102 + ... + 755.

It is an arithmetic number, because the mean of its divisors is an integer number (47190).

2²⁸⁰²³⁹ is an apocalyptic number.

280239 is a deficient number, since it is larger than the sum of its proper divisors (97281).

280239 is a wasteful number, since it uses less digits than its factorization.

280239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 969.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 280239 is about 529.3760478148. The cubic root of 280239 is about 65.4399348351.

It can be divided in two parts, 2802 and 39, that multiplied together give a triangular number (109278 = T₄₆₇).

The spelling of 280239 in words is "two hundred eighty thousand, two hundred thirty-nine".