389815 has 8 divisors (see below), whose sum is σ = 476928. Its totient is φ = 305760.

The previous prime is 389797. The next prime is 389819. The reversal of 389815 is 518983.

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

It is not a de Polignac number, because 389815 - 2⁵ = 389783 is a prime.

It is a Duffinian number.

389815 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 471 + ... + 1000.

It is an arithmetic number, because the mean of its divisors is an integer number (59616).

389815 is a Friedman number, since it can be written as 5^8-81-9^3, using all its digits and the basic arithmetic operations.

2³⁸⁹⁸¹⁵ is an apocalyptic number.

389815 is a deficient number, since it is larger than the sum of its proper divisors (87113).

389815 is a wasteful number, since it uses less digits than its factorization.

389815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1529.

The product of its digits is 8640, while the sum is 34.

The square root of 389815 is about 624.3516637281. The cubic root of 389815 is about 73.0498814642.

The spelling of 389815 in words is "three hundred eighty-nine thousand, eight hundred fifteen".