667879439 has 2 divisors, whose sum is σ = 667879440. Its totient is φ = 667879438.

The previous prime is 667879403. The next prime is 667879453. The reversal of 667879439 is 934978766.

667879439 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 667879439 - 2⁸ = 667879183 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667879039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333939719 + 333939720.

It is an arithmetic number, because the mean of its divisors is an integer number (333939720).

Almost surely, 2^667879439 is an apocalyptic number.

667879439 is a deficient number, since it is larger than the sum of its proper divisors (1).

667879439 is an equidigital number, since it uses as much as digits as its factorization.

667879439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13716864, while the sum is 59.

The square root of 667879439 is about 25843.3635388275. The cubic root of 667879439 is about 874.1098709506.

The spelling of 667879439 in words is "six hundred sixty-seven million, eight hundred seventy-nine thousand, four hundred thirty-nine".