389621 has 2 divisors, whose sum is σ = 389622. Its totient is φ = 389620.

The previous prime is 389591. The next prime is 389629. The reversal of 389621 is 126983.

389621 is nontrivially palindromic in base 16.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 343396 + 46225 = 586^2 + 215^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-389621 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 389621.

It is not a weakly prime, because it can be changed into another prime (389629) 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 as a sum of consecutive naturals, namely, 194810 + 194811.

It is an arithmetic number, because the mean of its divisors is an integer number (194811).

2³⁸⁹⁶²¹ is an apocalyptic number.

It is an amenable number.

389621 is a deficient number, since it is larger than the sum of its proper divisors (1).

389621 is an equidigital number, since it uses as much as digits as its factorization.

389621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 29.

The square root of 389621 is about 624.1962832315. The cubic root of 389621 is about 73.0377611605.

The spelling of 389621 in words is "three hundred eighty-nine thousand, six hundred twenty-one".