389805 has 16 divisors (see below), whose sum is σ = 672000. Its totient is φ = 191808.

The previous prime is 389797. The next prime is 389819. The reversal of 389805 is 508983.

389805 = T₁₆₀ + T₁₆₁ + ... + T₁₈₅.

It is not a de Polignac number, because 389805 - 2³ = 389797 is a prime.

389805 is a lucky number.

It is a nialpdrome in base 5.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 805 + ... + 1194.

It is an arithmetic number, because the mean of its divisors is an integer number (42000).

2³⁸⁹⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

389805 is a deficient number, since it is larger than the sum of its proper divisors (282195).

389805 is a wasteful number, since it uses less digits than its factorization.

389805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2020.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 389805 is about 624.3436553694. The cubic root of 389805 is about 73.0492568046.

The spelling of 389805 in words is "three hundred eighty-nine thousand, eight hundred five".