278923 has 4 divisors (see below), whose sum is σ = 285768. Its totient is φ = 272080.

The previous prime is 278917. The next prime is 278947. The reversal of 278923 is 329872.

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 278923 - 2⁵ = 278891 is a prime.

It is a d-powerful number, because it can be written as 2⁸ + 7² + 9 + 8⁶ + 2¹⁴ + 3⁴ .

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (278903) 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, 3361 + ... + 3442.

It is an arithmetic number, because the mean of its divisors is an integer number (71442).

2²⁷⁸⁹²³ is an apocalyptic number.

278923 is a deficient number, since it is larger than the sum of its proper divisors (6845).

278923 is an equidigital number, since it uses as much as digits as its factorization.

278923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6844.

The product of its digits is 6048, while the sum is 31.

The square root of 278923 is about 528.1316123846. The cubic root of 278923 is about 65.3373389418.

The spelling of 278923 in words is "two hundred seventy-eight thousand, nine hundred twenty-three".