389447581 has 2 divisors, whose sum is σ = 389447582. Its totient is φ = 389447580.

The previous prime is 389447563. The next prime is 389447599. The reversal of 389447581 is 185744983.

It is a balanced prime because it is at equal distance from previous prime (389447563) and next prime (389447599).

It can be written as a sum of positive squares in only one way, i.e., 333062500 + 56385081 = 18250^2 + 7509^2 .

It is a cyclic number.

It is not a de Polignac number, because 389447581 - 2⁵ = 389447549 is a prime.

It is a super-2 number, since 2×389447581² = 303338836693503122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (389444581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194723790 + 194723791.

It is an arithmetic number, because the mean of its divisors is an integer number (194723791).

Almost surely, 2^389447581 is an apocalyptic number.

It is an amenable number.

389447581 is a deficient number, since it is larger than the sum of its proper divisors (1).

389447581 is an equidigital number, since it uses as much as digits as its factorization.

389447581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 967680, while the sum is 49.

The square root of 389447581 is about 19734.4262901155. The cubic root of 389447581 is about 730.2692326488.

The spelling of 389447581 in words is "three hundred eighty-nine million, four hundred forty-seven thousand, five hundred eighty-one".