4389491789 has 2 divisors, whose sum is σ = 4389491790. Its totient is φ = 4389491788.

The previous prime is 4389491731. The next prime is 4389491807. The reversal of 4389491789 is 9871949834.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3938566564 + 450925225 = 62758^2 + 21235^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4389491789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4389491719) 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, 2194745894 + 2194745895.

It is an arithmetic number, because the mean of its divisors is an integer number (2194745895).

Almost surely, 2^4389491789 is an apocalyptic number.

It is an amenable number.

4389491789 is a deficient number, since it is larger than the sum of its proper divisors (1).

4389491789 is an equidigital number, since it uses as much as digits as its factorization.

4389491789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15676416, while the sum is 62.

The square root of 4389491789 is about 66253.2398377619. The cubic root of 4389491789 is about 1637.3370163834.

The spelling of 4389491789 in words is "four billion, three hundred eighty-nine million, four hundred ninety-one thousand, seven hundred eighty-nine".