387865 has 4 divisors (see below), whose sum is σ = 465444. Its totient is φ = 310288.

The previous prime is 387857. The next prime is 387911. The reversal of 387865 is 568783.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 290521 + 97344 = 539^2 + 312^2 .

It is a cyclic number.

It is not a de Polignac number, because 387865 - 2³ = 387857 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38782 + ... + 38791.

It is an arithmetic number, because the mean of its divisors is an integer number (116361).

2³⁸⁷⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

387865 is a deficient number, since it is larger than the sum of its proper divisors (77579).

387865 is an equidigital number, since it uses as much as digits as its factorization.

387865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77578.

The product of its digits is 40320, while the sum is 37.

The square root of 387865 is about 622.7880859490. The cubic root of 387865 is about 72.9278702059.

The spelling of 387865 in words is "three hundred eighty-seven thousand, eight hundred sixty-five".