667004399 has 2 divisors, whose sum is σ = 667004400. Its totient is φ = 667004398.

The previous prime is 667004383. The next prime is 667004423. The reversal of 667004399 is 993400766.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 667004399 - 2⁴ = 667004383 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667001399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333502199 + 333502200.

It is an arithmetic number, because the mean of its divisors is an integer number (333502200).

Almost surely, 2^667004399 is an apocalyptic number.

667004399 is a deficient number, since it is larger than the sum of its proper divisors (1).

667004399 is an equidigital number, since it uses as much as digits as its factorization.

667004399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 244944, while the sum is 44.

The square root of 667004399 is about 25826.4283051296. The cubic root of 667004399 is about 873.7279580168.

The spelling of 667004399 in words is "six hundred sixty-seven million, four thousand, three hundred ninety-nine".