278494 has 8 divisors (see below), whose sum is σ = 442368. Its totient is φ = 131040.

The previous prime is 278491. The next prime is 278497. The reversal of 278494 is 494872.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (278491) and next prime (278497).

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

It is a super-3 number, since 3×278494³ = 64799071603733352, which contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34), and also a Moran number because the ratio is a prime number: 8191 = 278494 / (2 + 7 + 8 + 4 + 9 + 4).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278491) 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 in 3 ways as a sum of consecutive naturals, for example, 4062 + ... + 4129.

It is an arithmetic number, because the mean of its divisors is an integer number (55296).

278494 is a Friedman number, since it can be written as (9+8)*(4^7-4+2), using all its digits and the basic arithmetic operations.

2²⁷⁸⁴⁹⁴ is an apocalyptic number.

278494 is a deficient number, since it is larger than the sum of its proper divisors (163874).

278494 is a wasteful number, since it uses less digits than its factorization.

278494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8210.

The product of its digits is 16128, while the sum is 34.

The square root of 278494 is about 527.7253073333. The cubic root of 278494 is about 65.3038241950.

The spelling of 278494 in words is "two hundred seventy-eight thousand, four hundred ninety-four".