278479 has 2 divisors, whose sum is σ = 278480. Its totient is φ = 278478.

The previous prime is 278459. The next prime is 278489. The reversal of 278479 is 974872.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 278479 - 2¹³ = 270287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139239 + 139240.

It is an arithmetic number, because the mean of its divisors is an integer number (139240).

278479 is a Friedman number, since it can be written as (9+8)*4^7-7^2, using all its digits and the basic arithmetic operations.

2²⁷⁸⁴⁷⁹ is an apocalyptic number.

278479 is a deficient number, since it is larger than the sum of its proper divisors (1).

278479 is an equidigital number, since it uses as much as digits as its factorization.

278479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 37.

The square root of 278479 is about 527.7110952027. The cubic root of 278479 is about 65.3026517282.

It can be divided in two parts, 278 and 479, that added together give a palindrome (757).

The spelling of 278479 in words is "two hundred seventy-eight thousand, four hundred seventy-nine".