279649 has 2 divisors, whose sum is σ = 279650. Its totient is φ = 279648.

The previous prime is 279641. The next prime is 279659. The reversal of 279649 is 946972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186624 + 93025 = 432^2 + 305^2 .

It is a cyclic number.

It is not a de Polignac number, because 279649 - 2³ = 279641 is a prime.

It is not a weakly prime, because it can be changed into another prime (279641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139824 + 139825.

It is an arithmetic number, because the mean of its divisors is an integer number (139825).

2²⁷⁹⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

279649 is a deficient number, since it is larger than the sum of its proper divisors (1).

279649 is an equidigital number, since it uses as much as digits as its factorization.

279649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 37.

The square root of 279649 is about 528.8184943816. The cubic root of 279649 is about 65.3939780045.

The spelling of 279649 in words is "two hundred seventy-nine thousand, six hundred forty-nine".