280135 has 8 divisors (see below), whose sum is σ = 339120. Its totient is φ = 222144.

The previous prime is 280129. The next prime is 280139. The reversal of 280135 is 531082.

It is a happy number.

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 280135 - 2⁵ = 280103 is a prime.

It is an Ulam number.

280135 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280139) 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, 739 + ... + 1051.

It is an arithmetic number, because the mean of its divisors is an integer number (42390).

2²⁸⁰¹³⁵ is an apocalyptic number.

280135 is a deficient number, since it is larger than the sum of its proper divisors (58985).

280135 is a wasteful number, since it uses less digits than its factorization.

280135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 280135 is about 529.2778098504. The cubic root of 280135 is about 65.4318386562.

The spelling of 280135 in words is "two hundred eighty thousand, one hundred thirty-five".