389921 has 8 divisors (see below), whose sum is σ = 454464. Its totient is φ = 327600.

The previous prime is 389911. The next prime is 389923. The reversal of 389921 is 129983.

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

It is not a de Polignac number, because 389921 - 2¹⁰ = 388897 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 389921.

It is not an unprimeable number, because it can be changed into a prime (389923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155 + ... + 896.

It is an arithmetic number, because the mean of its divisors is an integer number (56808).

2³⁸⁹⁹²¹ is an apocalyptic number.

It is an amenable number.

389921 is a deficient number, since it is larger than the sum of its proper divisors (64543).

389921 is a wasteful number, since it uses less digits than its factorization.

389921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111.

The product of its digits is 3888, while the sum is 32.

The square root of 389921 is about 624.4365460157. The cubic root of 389921 is about 73.0565021994.

The spelling of 389921 in words is "three hundred eighty-nine thousand, nine hundred twenty-one".