278338 has 4 divisors (see below), whose sum is σ = 417510. Its totient is φ = 139168.

The previous prime is 278329. The next prime is 278347. The reversal of 278338 is 833872.

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

It is an interprime number because it is at equal distance from previous prime (278329) and next prime (278347).

It can be written as a sum of positive squares in only one way, i.e., 247009 + 31329 = 497^2 + 177^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69583 + ... + 69586.

2²⁷⁸³³⁸ is an apocalyptic number.

278338 is a deficient number, since it is larger than the sum of its proper divisors (139172).

278338 is a wasteful number, since it uses less digits than its factorization.

278338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139171.

The product of its digits is 8064, while the sum is 31.

The square root of 278338 is about 527.5774824611. The cubic root of 278338 is about 65.2916284812.

It can be divided in two parts, 278 and 338, that added together give a palindrome (616).

The spelling of 278338 in words is "two hundred seventy-eight thousand, three hundred thirty-eight".