278195 has 4 divisors (see below), whose sum is σ = 333840. Its totient is φ = 222552.

The previous prime is 278191. The next prime is 278207. The reversal of 278195 is 591872.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 278195 - 2² = 278191 is a prime.

It is not an unprimeable number, because it can be changed into a prime (278191) 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, 27815 + ... + 27824.

It is an arithmetic number, because the mean of its divisors is an integer number (83460).

2²⁷⁸¹⁹⁵ is an apocalyptic number.

278195 is a deficient number, since it is larger than the sum of its proper divisors (55645).

278195 is an equidigital number, since it uses as much as digits as its factorization.

278195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55644.

The product of its digits is 5040, while the sum is 32.

The square root of 278195 is about 527.4419399327. The cubic root of 278195 is about 65.2804450732.

The spelling of 278195 in words is "two hundred seventy-eight thousand, one hundred ninety-five".