387685 has 8 divisors (see below), whose sum is σ = 492696. Its totient is φ = 291840.

The previous prime is 387683. The next prime is 387707. The reversal of 387685 is 586783.

It can be written as a sum of positive squares in 4 ways, for example, as 54756 + 332929 = 234^2 + 577^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 387685 - 2¹ = 387683 is a prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 3³ + 8² + 6⁵ + 7⁶ + 8⁶ + 5² .

It is a Duffinian number.

387685 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387683) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2196 + ... + 2365.

It is an arithmetic number, because the mean of its divisors is an integer number (61587).

2³⁸⁷⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

387685 is a deficient number, since it is larger than the sum of its proper divisors (105011).

387685 is a wasteful number, since it uses less digits than its factorization.

387685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4583.

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

The square root of 387685 is about 622.6435577439. The cubic root of 387685 is about 72.9165870294.

The spelling of 387685 in words is "three hundred eighty-seven thousand, six hundred eighty-five".