389915 has 4 divisors (see below), whose sum is σ = 467904. Its totient is φ = 311928.

The previous prime is 389911. The next prime is 389923. The reversal of 389915 is 519983.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 519983 = 53 ⋅9811.

It is a cyclic number.

It is not a de Polignac number, because 389915 - 2² = 389911 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (389911) 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, 38987 + ... + 38996.

It is an arithmetic number, because the mean of its divisors is an integer number (116976).

389915 is a Friedman number, since it can be written as 19-9^3+5^8, using all its digits and the basic arithmetic operations.

2³⁸⁹⁹¹⁵ is an apocalyptic number.

389915 is a deficient number, since it is larger than the sum of its proper divisors (77989).

389915 is an equidigital number, since it uses as much as digits as its factorization.

389915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77988.

The product of its digits is 9720, while the sum is 35.

The square root of 389915 is about 624.4317416660. The cubic root of 389915 is about 73.0561274729.

It can be divided in two parts, 3899 and 15, that multiplied together give a palindrome (58485).

The spelling of 389915 in words is "three hundred eighty-nine thousand, nine hundred fifteen".