278198 has 8 divisors (see below), whose sum is σ = 439320. Its totient is φ = 131760.

The previous prime is 278191. The next prime is 278207. The reversal of 278198 is 891872.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

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, 3623 + ... + 3698.

It is an arithmetic number, because the mean of its divisors is an integer number (54915).

2²⁷⁸¹⁹⁸ is an apocalyptic number.

278198 is a deficient number, since it is larger than the sum of its proper divisors (161122).

278198 is a wasteful number, since it uses less digits than its factorization.

278198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7342.

The product of its digits is 8064, while the sum is 35.

The square root of 278198 is about 527.4447838400. Note that the first 3 decimals coincide. The cubic root of 278198 is about 65.2806797295.

The spelling of 278198 in words is "two hundred seventy-eight thousand, one hundred ninety-eight".