280731 has 16 divisors (see below), whose sum is σ = 419328. Its totient is φ = 165600.

The previous prime is 280729. The next prime is 280751. The reversal of 280731 is 137082.

It is not a de Polignac number, because 280731 - 2¹ = 280729 is a prime.

It is a super-2 number, since 2×280731² = 157619788722, which contains 22 as substring.

It is a plaindrome in base 16.

It is a nialpdrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 280698 and 280707.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 280731.

It is not an unprimeable number, because it can be changed into a prime (280711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1461 + ... + 1641.

It is an arithmetic number, because the mean of its divisors is an integer number (26208).

2²⁸⁰⁷³¹ is an apocalyptic number.

280731 is a deficient number, since it is larger than the sum of its proper divisors (138597).

280731 is a wasteful number, since it uses less digits than its factorization.

280731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 280731 is about 529.8405420502. The cubic root of 280731 is about 65.4782088613.

The spelling of 280731 in words is "two hundred eighty thousand, seven hundred thirty-one".