279847 has 2 divisors, whose sum is σ = 279848. Its totient is φ = 279846.

The previous prime is 279823. The next prime is 279857. The reversal of 279847 is 748972.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-279847 is a prime.

It is a Chen prime.

It is a d-powerful number, because it can be written as 2⁵ + 7³ + 8³ + 9 + 4⁹ + 7⁵ .

It is a nialpdrome in base 6.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (279817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139923 + 139924.

It is an arithmetic number, because the mean of its divisors is an integer number (139924).

279847 is a Friedman number, since it can be written as 8-97+(4+2)^7, using all its digits and the basic arithmetic operations.

2²⁷⁹⁸⁴⁷ is an apocalyptic number.

279847 is a deficient number, since it is larger than the sum of its proper divisors (1).

279847 is an equidigital number, since it uses as much as digits as its factorization.

279847 is an evil number, because the sum of its binary digits is even.

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

The square root of 279847 is about 529.0056710471. The cubic root of 279847 is about 65.4094080054.

The spelling of 279847 in words is "two hundred seventy-nine thousand, eight hundred forty-seven".