280995 has 32 divisors (see below), whose sum is σ = 532224. Its totient is φ = 124800.

The previous prime is 280979. The next prime is 280997. The reversal of 280995 is 599082.

It is not a de Polignac number, because 280995 - 2⁴ = 280979 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 280995.

It is not an unprimeable number, because it can be changed into a prime (280997) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2080 + ... + 2210.

It is an arithmetic number, because the mean of its divisors is an integer number (16632).

2²⁸⁰⁹⁹⁵ is an apocalyptic number.

280995 is a deficient number, since it is larger than the sum of its proper divisors (251229).

280995 is a wasteful number, since it uses less digits than its factorization.

280995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 280995 is about 530.0896150652. The cubic root of 280995 is about 65.4987277107.

280995 divided by its sum of digits (33) gives a triangular number (8515 = T₁₃₀).

It can be divided in two parts, 280 and 995, that added together give a triangular number (1275 = T₅₀).

The spelling of 280995 in words is "two hundred eighty thousand, nine hundred ninety-five".