387789 has 4 divisors (see below), whose sum is σ = 517056. Its totient is φ = 258524.

The previous prime is 387781. The next prime is 387791. The reversal of 387789 is 987783.

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 387789 - 2³ = 387781 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 387789.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 387789.

It is not an unprimeable number, because it can be changed into a prime (387781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64629 + ... + 64634.

It is an arithmetic number, because the mean of its divisors is an integer number (129264).

2³⁸⁷⁷⁸⁹ is an apocalyptic number.

It is an amenable number.

387789 is a deficient number, since it is larger than the sum of its proper divisors (129267).

387789 is a wasteful number, since it uses less digits than its factorization.

387789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129266.

The product of its digits is 84672, while the sum is 42.

The square root of 387789 is about 622.7270670205. The cubic root of 387789 is about 72.9231066240.

It can be divided in two parts, 387 and 789, that added together give a triangular number (1176 = T₄₈).

The spelling of 387789 in words is "three hundred eighty-seven thousand, seven hundred eighty-nine".