278369 has 24 divisors (see below), whose sum is σ = 383040. Its totient is φ = 199584.

The previous prime is 278363. The next prime is 278387. The reversal of 278369 is 963872.

278369 is nontrivially palindromic in base 14.

It is not a de Polignac number, because 278369 - 2⁴ = 278353 is a prime.

It is a super-2 number, since 2×278369² = 154978600322, which contains 22 as substring.

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

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (278363) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12092 + ... + 12114.

It is an arithmetic number, because the mean of its divisors is an integer number (15960).

2²⁷⁸³⁶⁹ is an apocalyptic number.

It is an amenable number.

278369 is a deficient number, since it is larger than the sum of its proper divisors (104671).

278369 is a wasteful number, since it uses less digits than its factorization.

278369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69 (or 62 counting only the distinct ones).

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

The square root of 278369 is about 527.6068612139. The cubic root of 278369 is about 65.2940523512.

The spelling of 278369 in words is "two hundred seventy-eight thousand, three hundred sixty-nine".