278140 has 12 divisors (see below), whose sum is σ = 584136. Its totient is φ = 111248.

The previous prime is 278123. The next prime is 278143. The reversal of 278140 is 41872.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278143) by changing a digit.

278140 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 6934 + ... + 6973.

It is an arithmetic number, because the mean of its divisors is an integer number (48678).

2²⁷⁸¹⁴⁰ is an apocalyptic number.

278140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

278140 is an abundant number, since it is smaller than the sum of its proper divisors (305996).

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

278140 is a wasteful number, since it uses less digits than its factorization.

278140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13916 (or 13914 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 278140 is about 527.3897989154. The cubic root of 278140 is about 65.2761427419.

The spelling of 278140 in words is "two hundred seventy-eight thousand, one hundred forty".