387861 has 4 divisors (see below), whose sum is σ = 517152. Its totient is φ = 258572.

The previous prime is 387857. The next prime is 387911. The reversal of 387861 is 168783.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 387861 - 2² = 387857 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387161) 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 3 ways as a sum of consecutive naturals, for example, 64641 + ... + 64646.

It is an arithmetic number, because the mean of its divisors is an integer number (129288).

2³⁸⁷⁸⁶¹ is an apocalyptic number.

It is an amenable number.

387861 is a deficient number, since it is larger than the sum of its proper divisors (129291).

387861 is a wasteful number, since it uses less digits than its factorization.

387861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129290.

The product of its digits is 8064, while the sum is 33.

The square root of 387861 is about 622.7848745755. The cubic root of 387861 is about 72.9276195066.

The spelling of 387861 in words is "three hundred eighty-seven thousand, eight hundred sixty-one".