278935 has 4 divisors (see below), whose sum is σ = 334728. Its totient is φ = 223144.

The previous prime is 278917. The next prime is 278947. The reversal of 278935 is 539872.

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 278935 - 2⁵ = 278903 is a prime.

It is a Duffinian number.

278935 is a lucky number.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 278935.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27889 + ... + 27898.

It is an arithmetic number, because the mean of its divisors is an integer number (83682).

2²⁷⁸⁹³⁵ is an apocalyptic number.

278935 is a deficient number, since it is larger than the sum of its proper divisors (55793).

278935 is an equidigital number, since it uses as much as digits as its factorization.

278935 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55792.

The product of its digits is 15120, while the sum is 34.

The square root of 278935 is about 528.1429730670. The cubic root of 278935 is about 65.3382759230.

The spelling of 278935 in words is "two hundred seventy-eight thousand, nine hundred thirty-five".