278238 has 16 divisors (see below), whose sum is σ = 564480. Its totient is φ = 91416.

The previous prime is 278237. The next prime is 278261. The reversal of 278238 is 832872.

278238 is nontrivially palindromic in base 5.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278233) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181 + ... + 767.

It is an arithmetic number, because the mean of its divisors is an integer number (35280).

2²⁷⁸²³⁸ is an apocalyptic number.

278238 is an abundant number, since it is smaller than the sum of its proper divisors (286242).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

278238 is a wasteful number, since it uses less digits than its factorization.

278238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671.

The product of its digits is 5376, while the sum is 30.

The square root of 278238 is about 527.4827011382. The cubic root of 278238 is about 65.2838083190.

The spelling of 278238 in words is "two hundred seventy-eight thousand, two hundred thirty-eight".