387665899 has 2 divisors, whose sum is σ = 387665900. Its totient is φ = 387665898.

The previous prime is 387665867. The next prime is 387665921. The reversal of 387665899 is 998566783.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 387665899 - 2⁵ = 387665867 is a prime.

It is not a weakly prime, because it can be changed into another prime (387665099) 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, 193832949 + 193832950.

It is an arithmetic number, because the mean of its divisors is an integer number (193832950).

Almost surely, 2^387665899 is an apocalyptic number.

387665899 is a deficient number, since it is larger than the sum of its proper divisors (1).

387665899 is an equidigital number, since it uses as much as digits as its factorization.

387665899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19595520, while the sum is 61.

The square root of 387665899 is about 19689.2330729259. The cubic root of 387665899 is about 729.1538949135.

The spelling of 387665899 in words is "three hundred eighty-seven million, six hundred sixty-five thousand, eight hundred ninety-nine".