278963 has 4 divisors (see below), whose sum is σ = 282408. Its totient is φ = 275520.

The previous prime is 278947. The next prime is 278981. The reversal of 278963 is 369872.

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 278963 - 2⁴ = 278947 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (278903) 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, 1598 + ... + 1763.

It is an arithmetic number, because the mean of its divisors is an integer number (70602).

2²⁷⁸⁹⁶³ is an apocalyptic number.

278963 is a deficient number, since it is larger than the sum of its proper divisors (3445).

278963 is an equidigital number, since it uses as much as digits as its factorization.

278963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3444.

The product of its digits is 18144, while the sum is 35.

The square root of 278963 is about 528.1694803754. The cubic root of 278963 is about 65.3404621080.

Subtracting 278963 from its reverse (369872), we obtain a palindrome (90909).

The spelling of 278963 in words is "two hundred seventy-eight thousand, nine hundred sixty-three".