278873 has 4 divisors (see below), whose sum is σ = 318720. Its totient is φ = 239028.

The previous prime is 278867. The next prime is 278879. The reversal of 278873 is 378872.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (278867) and next prime (278879).

It is a cyclic number.

It is not a de Polignac number, because 278873 - 2⁶ = 278809 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 278873.

It is not an unprimeable number, because it can be changed into a prime (278879) 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, 19913 + ... + 19926.

It is an arithmetic number, because the mean of its divisors is an integer number (79680).

2²⁷⁸⁸⁷³ is an apocalyptic number.

It is an amenable number.

278873 is a deficient number, since it is larger than the sum of its proper divisors (39847).

278873 is an equidigital number, since it uses as much as digits as its factorization.

278873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39846.

The product of its digits is 18816, while the sum is 35.

The square root of 278873 is about 528.0842735776. The cubic root of 278873 is about 65.3334345641. Note that the first 3 decimals are identical.

Subtracting 278873 from its reverse (378872), we obtain a palindrome (99999).

The spelling of 278873 in words is "two hundred seventy-eight thousand, eight hundred seventy-three".