279689 has 2 divisors, whose sum is σ = 279690. Its totient is φ = 279688.

The previous prime is 279679. The next prime is 279707. The reversal of 279689 is 986972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153664 + 126025 = 392^2 + 355^2 .

It is a cyclic number.

It is not a de Polignac number, because 279689 - 2¹² = 275593 is a prime.

It is a Chen prime.

It is a plaindrome in base 16.

It is not a weakly prime, because it can be changed into another prime (279619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139844 + 139845.

It is an arithmetic number, because the mean of its divisors is an integer number (139845).

2²⁷⁹⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

279689 is a deficient number, since it is larger than the sum of its proper divisors (1).

279689 is an equidigital number, since it uses as much as digits as its factorization.

279689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 41.

The square root of 279689 is about 528.8563131891. The cubic root of 279689 is about 65.3970957633.

The spelling of 279689 in words is "two hundred seventy-nine thousand, six hundred eighty-nine".