667840039 has 2 divisors, whose sum is σ = 667840040. Its totient is φ = 667840038.

The previous prime is 667840003. The next prime is 667840051. The reversal of 667840039 is 930048766.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 667840039 - 2¹³ = 667831847 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 667839977 and 667840004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667840079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333920019 + 333920020.

It is an arithmetic number, because the mean of its divisors is an integer number (333920020).

Almost surely, 2^667840039 is an apocalyptic number.

667840039 is a deficient number, since it is larger than the sum of its proper divisors (1).

667840039 is an equidigital number, since it uses as much as digits as its factorization.

667840039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 667840039 is about 25842.6012429090. The cubic root of 667840039 is about 874.0926819171.

The spelling of 667840039 in words is "six hundred sixty-seven million, eight hundred forty thousand, thirty-nine".