278147 has 2 divisors, whose sum is σ = 278148. Its totient is φ = 278146.

The previous prime is 278143. The next prime is 278149. The reversal of 278147 is 741872.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 278147 - 2² = 278143 is a prime.

Together with 278149, it forms a pair of twin primes.

It is a Chen prime.

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

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 278147.

It is not a weakly prime, because it can be changed into another prime (278143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139073 + 139074.

It is an arithmetic number, because the mean of its divisors is an integer number (139074).

2²⁷⁸¹⁴⁷ is an apocalyptic number.

278147 is a deficient number, since it is larger than the sum of its proper divisors (1).

278147 is an equidigital number, since it uses as much as digits as its factorization.

278147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3136, while the sum is 29.

The square root of 278147 is about 527.3964353311. The cubic root of 278147 is about 65.2766903429.

The spelling of 278147 in words is "two hundred seventy-eight thousand, one hundred forty-seven".