278269 has 2 divisors, whose sum is σ = 278270. Its totient is φ = 278268.

The previous prime is 278261. The next prime is 278279. The reversal of 278269 is 962872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164025 + 114244 = 405^2 + 338^2 .

It is a cyclic number.

It is not a de Polignac number, because 278269 - 2³ = 278261 is a prime.

It is a super-2 number, since 2×278269² = 154867272722, which contains 22 as substring.

It is a nialpdrome in base 13.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139134 + 139135.

It is an arithmetic number, because the mean of its divisors is an integer number (139135).

2²⁷⁸²⁶⁹ is an apocalyptic number.

It is an amenable number.

278269 is a deficient number, since it is larger than the sum of its proper divisors (1).

278269 is an equidigital number, since it uses as much as digits as its factorization.

278269 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 34.

The square root of 278269 is about 527.5120851696. The cubic root of 278269 is about 65.2862327697.

The spelling of 278269 in words is "two hundred seventy-eight thousand, two hundred sixty-nine".