278542 has 12 divisors (see below), whose sum is σ = 459648. Its totient is φ = 126500.

The previous prime is 278503. The next prime is 278543. The reversal of 278542 is 245872.

It is a self number, because there is not a number n which added to its sum of digits gives 278542.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 334 + ... + 817.

It is an arithmetic number, because the mean of its divisors is an integer number (38304).

2²⁷⁸⁵⁴² is an apocalyptic number.

278542 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

278542 is a deficient number, since it is larger than the sum of its proper divisors (181106).

278542 is a wasteful number, since it uses less digits than its factorization.

278542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1175 (or 1164 counting only the distinct ones).

The product of its digits is 4480, while the sum is 28.

The square root of 278542 is about 527.7707835794. The cubic root of 278542 is about 65.3075758060.

It can be divided in two parts, 278 and 542, that added together give a triangular number (820 = T₄₀).

The spelling of 278542 in words is "two hundred seventy-eight thousand, five hundred forty-two".