278215 has 8 divisors (see below), whose sum is σ = 381600. Its totient is φ = 190752.

The previous prime is 278209. The next prime is 278219. The reversal of 278215 is 512872.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 278215 - 2³ = 278207 is a prime.

278215 is a lucky number.

It is a nialpdrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 278215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278219) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 3940 + ... + 4009.

It is an arithmetic number, because the mean of its divisors is an integer number (47700).

2²⁷⁸²¹⁵ is an apocalyptic number.

278215 is a deficient number, since it is larger than the sum of its proper divisors (103385).

278215 is an equidigital number, since it uses as much as digits as its factorization.

278215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7961.

The product of its digits is 1120, while the sum is 25.

The square root of 278215 is about 527.4608990248. The cubic root of 278215 is about 65.2820094167.

The spelling of 278215 in words is "two hundred seventy-eight thousand, two hundred fifteen".