390666587 has 2 divisors, whose sum is σ = 390666588. Its totient is φ = 390666586.

The previous prime is 390666583. The next prime is 390666593. The reversal of 390666587 is 785666093.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 390666587 - 2² = 390666583 is a prime.

It is not a weakly prime, because it can be changed into another prime (390666583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195333293 + 195333294.

It is an arithmetic number, because the mean of its divisors is an integer number (195333294).

Almost surely, 2^390666587 is an apocalyptic number.

390666587 is a deficient number, since it is larger than the sum of its proper divisors (1).

390666587 is an equidigital number, since it uses as much as digits as its factorization.

390666587 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1632960, while the sum is 50.

The square root of 390666587 is about 19765.2874251805. The cubic root of 390666587 is about 731.0303752061.

The spelling of 390666587 in words is "three hundred ninety million, six hundred sixty-six thousand, five hundred eighty-seven".