390599987 has 2 divisors, whose sum is σ = 390599988. Its totient is φ = 390599986.

The previous prime is 390599971. The next prime is 390600037. The reversal of 390599987 is 789995093.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 390599987 - 2⁴ = 390599971 is a prime.

It is not a weakly prime, because it can be changed into another prime (390599947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195299993 + 195299994.

It is an arithmetic number, because the mean of its divisors is an integer number (195299994).

Almost surely, 2^390599987 is an apocalyptic number.

390599987 is a deficient number, since it is larger than the sum of its proper divisors (1).

390599987 is an equidigital number, since it uses as much as digits as its factorization.

390599987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5511240, while the sum is 59.

The square root of 390599987 is about 19763.6025815133. The cubic root of 390599987 is about 730.9888313496.

The spelling of 390599987 in words is "three hundred ninety million, five hundred ninety-nine thousand, nine hundred eighty-seven".