279664223 has 2 divisors, whose sum is σ = 279664224. Its totient is φ = 279664222.

The previous prime is 279664219. The next prime is 279664283. The reversal of 279664223 is 322466972.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 279664223 - 2² = 279664219 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (279664283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139832111 + 139832112.

It is an arithmetic number, because the mean of its divisors is an integer number (139832112).

Almost surely, 2^279664223 is an apocalyptic number.

279664223 is a deficient number, since it is larger than the sum of its proper divisors (1).

279664223 is an equidigital number, since it uses as much as digits as its factorization.

279664223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 41.

The square root of 279664223 is about 16723.1642639783. The cubic root of 279664223 is about 653.9516458060.

The spelling of 279664223 in words is "two hundred seventy-nine million, six hundred sixty-four thousand, two hundred twenty-three".