280969 has 4 divisors (see below), whose sum is σ = 302596. Its totient is φ = 259344.

The previous prime is 280967. The next prime is 280979. The reversal of 280969 is 969082.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 190969 + 90000 = 437^2 + 300^2 .

It is a cyclic number.

It is not a de Polignac number, because 280969 - 2¹ = 280967 is a prime.

It is a super-2 number, since 2×280969² = 157887157922, which contains 22 as substring.

It is a Duffinian number.

280969 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (280963) 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 3 ways as a sum of consecutive naturals, for example, 10794 + ... + 10819.

It is an arithmetic number, because the mean of its divisors is an integer number (75649).

2²⁸⁰⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

280969 is a deficient number, since it is larger than the sum of its proper divisors (21627).

280969 is a wasteful number, since it uses less digits than its factorization.

280969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21626.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 280969 is about 530.0650903427. The cubic root of 280969 is about 65.4967074856.

The spelling of 280969 in words is "two hundred eighty thousand, nine hundred sixty-nine".