280930 has 16 divisors (see below), whose sum is σ = 544824. Its totient is φ = 103680.

The previous prime is 280927. The next prime is 280933. The reversal of 280930 is 39082.

280930 = T₁₀₀ + T₁₀₁ + ... + T₁₃₈.

It is an interprime number because it is at equal distance from previous prime (280927) and next prime (280933).

It can be written as a sum of positive squares in 4 ways, for example, as 192721 + 88209 = 439^2 + 297^2 .

It is a plaindrome in base 12.

It is a zygodrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (280933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 951 + ... + 1210.

2²⁸⁰⁹³⁰ is an apocalyptic number.

280930 is a deficient number, since it is larger than the sum of its proper divisors (263894).

280930 is a wasteful number, since it uses less digits than its factorization.

280930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2181.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 280930 is about 530.0283011312. The cubic root of 280930 is about 65.4936769142.

The spelling of 280930 in words is "two hundred eighty thousand, nine hundred thirty".