278249 has 4 divisors (see below), whose sum is σ = 282240. Its totient is φ = 274260.

The previous prime is 278237. The next prime is 278261. The reversal of 278249 is 942872.

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 an interprime number because it is at equal distance from previous prime (278237) and next prime (278261).

It is a cyclic number.

It is not a de Polignac number, because 278249 - 2⁴ = 278233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (278209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1889 + ... + 2030.

It is an arithmetic number, because the mean of its divisors is an integer number (70560).

2²⁷⁸²⁴⁹ is an apocalyptic number.

It is an amenable number.

278249 is a deficient number, since it is larger than the sum of its proper divisors (3991).

278249 is an equidigital number, since it uses as much as digits as its factorization.

278249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3990.

The product of its digits is 8064, while the sum is 32.

The square root of 278249 is about 527.4931279173. The cubic root of 278249 is about 65.2846686286.

The spelling of 278249 in words is "two hundred seventy-eight thousand, two hundred forty-nine".