278872243 has 16 divisors (see below), whose sum is σ = 308588896. Its totient is φ = 250387200.

The previous prime is 278872229. The next prime is 278872247. The reversal of 278872243 is 342278872.

It is a happy number.

278872243 is nontrivially palindromic in base 12.

It is a cyclic number.

It is not a de Polignac number, because 278872243 - 2⁹ = 278871731 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 278872243.

It is not an unprimeable number, because it can be changed into a prime (278872247) 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 15 ways as a sum of consecutive naturals, for example, 153943 + ... + 155743.

It is an arithmetic number, because the mean of its divisors is an integer number (19286806).

Almost surely, 2^278872243 is an apocalyptic number.

278872243 is a deficient number, since it is larger than the sum of its proper divisors (29716653).

278872243 is a wasteful number, since it uses less digits than its factorization.

278872243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2134.

The product of its digits is 301056, while the sum is 43.

The square root of 278872243 is about 16699.4683448306. The cubic root of 278872243 is about 653.3337544828. Note that the first 3 decimals are identical.

278872243 divided by its sum of digits (43) gives a triangular number (6485401 = T₃₆₀₁).

The spelling of 278872243 in words is "two hundred seventy-eight million, eight hundred seventy-two thousand, two hundred forty-three".