280165 has 8 divisors (see below), whose sum is σ = 339480. Its totient is φ = 221952.

The previous prime is 280139. The next prime is 280183. The reversal of 280165 is 561082.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 91809 + 188356 = 303^2 + 434^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 280165 - 2⁷ = 280037 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 481 + ... + 889.

It is an arithmetic number, because the mean of its divisors is an integer number (42435).

2²⁸⁰¹⁶⁵ is an apocalyptic number.

It is an amenable number.

280165 is a deficient number, since it is larger than the sum of its proper divisors (59315).

280165 is a wasteful number, since it uses less digits than its factorization.

280165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 280165 is about 529.3061495959. The cubic root of 280165 is about 65.4341742980.

The spelling of 280165 in words is "two hundred eighty thousand, one hundred sixty-five".