389391 has 16 divisors (see below), whose sum is σ = 552960. Its totient is φ = 243360.

The previous prime is 389381. The next prime is 389399. The reversal of 389391 is 193983.

It is not a de Polignac number, because 389391 - 2⁹ = 388879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389399) 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 15 ways as a sum of consecutive naturals, for example, 4890 + ... + 4968.

It is an arithmetic number, because the mean of its divisors is an integer number (34560).

2³⁸⁹³⁹¹ is an apocalyptic number.

389391 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

389391 is a deficient number, since it is larger than the sum of its proper divisors (163569).

389391 is a wasteful number, since it uses less digits than its factorization.

389391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166.

The product of its digits is 5832, while the sum is 33.

The square root of 389391 is about 624.0120191150. The cubic root of 389391 is about 73.0233865147.

It can be divided in two parts, 389 and 391, that added together give a triangular number (780 = T₃₉).

The spelling of 389391 in words is "three hundred eighty-nine thousand, three hundred ninety-one".