280907 has 4 divisors (see below), whose sum is σ = 306456. Its totient is φ = 255360.

The previous prime is 280897. The next prime is 280909. The reversal of 280907 is 709082.

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

It is a cyclic number.

It is not a de Polignac number, because 280907 - 2⁶ = 280843 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 12.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 280907.

It is not an unprimeable number, because it can be changed into a prime (280909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12758 + ... + 12779.

It is an arithmetic number, because the mean of its divisors is an integer number (76614).

2²⁸⁰⁹⁰⁷ is an apocalyptic number.

280907 is a deficient number, since it is larger than the sum of its proper divisors (25549).

280907 is a wasteful number, since it uses less digits than its factorization.

280907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25548.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 280907 is about 530.0066037324. The cubic root of 280907 is about 65.4918895227.

Adding to 280907 its reverse (709082), we get a palindrome (989989).

The spelling of 280907 in words is "two hundred eighty thousand, nine hundred seven".