278969 has 4 divisors (see below), whose sum is σ = 288000. Its totient is φ = 269940.

The previous prime is 278947. The next prime is 278981. The reversal of 278969 is 969872.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-278969 is a prime.

It is a super-2 number, since 2×278969² = 155647405922, which contains 22 as substring.

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 (278909) 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, 4469 + ... + 4530.

It is an arithmetic number, because the mean of its divisors is an integer number (72000).

2²⁷⁸⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

278969 is a deficient number, since it is larger than the sum of its proper divisors (9031).

278969 is an equidigital number, since it uses as much as digits as its factorization.

278969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9030.

The product of its digits is 54432, while the sum is 41.

The square root of 278969 is about 528.1751603398. The cubic root of 278969 is about 65.3409305571.

The spelling of 278969 in words is "two hundred seventy-eight thousand, nine hundred sixty-nine".