389421 has 8 divisors (see below), whose sum is σ = 576960. Its totient is φ = 259596.

The previous prime is 389401. The next prime is 389437. The reversal of 389421 is 124983.

It is not a de Polignac number, because 389421 - 2⁶ = 389357 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 14423 = 389421 / (3 + 8 + 9 + 4 + 2 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389401) 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 7 ways as a sum of consecutive naturals, for example, 7185 + ... + 7238.

It is an arithmetic number, because the mean of its divisors is an integer number (72120).

2³⁸⁹⁴²¹ is an apocalyptic number.

It is an amenable number.

389421 is a deficient number, since it is larger than the sum of its proper divisors (187539).

389421 is a wasteful number, since it uses less digits than its factorization.

389421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14432 (or 14426 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 389421 is about 624.0360566506. The cubic root of 389421 is about 73.0252617894.

The spelling of 389421 in words is "three hundred eighty-nine thousand, four hundred twenty-one".