389639 has 4 divisors (see below), whose sum is σ = 402240. Its totient is φ = 377040.

The previous prime is 389629. The next prime is 389651. The reversal of 389639 is 936983.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 936983 = 251 ⋅3733.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-389639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389629) 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, 6254 + ... + 6315.

It is an arithmetic number, because the mean of its divisors is an integer number (100560).

2³⁸⁹⁶³⁹ is an apocalyptic number.

389639 is a deficient number, since it is larger than the sum of its proper divisors (12601).

389639 is a wasteful number, since it uses less digits than its factorization.

389639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12600.

The product of its digits is 34992, while the sum is 38.

The square root of 389639 is about 624.2107016064. The cubic root of 389639 is about 73.0388858941.

The spelling of 389639 in words is "three hundred eighty-nine thousand, six hundred thirty-nine".