389958221 has 2 divisors, whose sum is σ = 389958222. Its totient is φ = 389958220.

The previous prime is 389958209. The next prime is 389958227. The reversal of 389958221 is 122859983.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 368102596 + 21855625 = 19186^2 + 4675^2 .

It is an emirp because it is prime and its reverse (122859983) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-389958221 is a prime.

It is a super-3 number, since 3×389958221³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (389958227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194979110 + 194979111.

It is an arithmetic number, because the mean of its divisors is an integer number (194979111).

Almost surely, 2^389958221 is an apocalyptic number.

It is an amenable number.

389958221 is a deficient number, since it is larger than the sum of its proper divisors (1).

389958221 is an equidigital number, since it uses as much as digits as its factorization.

389958221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 47.

The square root of 389958221 is about 19747.3598488507. The cubic root of 389958221 is about 730.5882672975.

The spelling of 389958221 in words is "three hundred eighty-nine million, nine hundred fifty-eight thousand, two hundred twenty-one".