280155 has 16 divisors (see below), whose sum is σ = 472320. Its totient is φ = 141408.

The previous prime is 280139. The next prime is 280183. The reversal of 280155 is 551082.

280155 = T₂₄₅ + T₂₄₆ + ... + T₂₅₃.

It is not a de Polignac number, because 280155 - 2⁴ = 280139 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 280155.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207 + ... + 776.

It is an arithmetic number, because the mean of its divisors is an integer number (29520).

2²⁸⁰¹⁵⁵ is an apocalyptic number.

280155 is a deficient number, since it is larger than the sum of its proper divisors (192165).

280155 is a wasteful number, since it uses less digits than its factorization.

280155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 280155 is about 529.2967031826. The cubic root of 280155 is about 65.4333957693.

It can be divided in two parts, 280 and 155, that added together give a triangular number (435 = T₂₉).

The spelling of 280155 in words is "two hundred eighty thousand, one hundred fifty-five".