3989887549 has 2 divisors, whose sum is σ = 3989887550. Its totient is φ = 3989887548.

The previous prime is 3989887547. The next prime is 3989887589. The reversal of 3989887549 is 9457889893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3971268324 + 18619225 = 63018^2 + 4315^2 .

It is a cyclic number.

It is not a de Polignac number, because 3989887549 - 2¹ = 3989887547 is a prime.

Together with 3989887547, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3989887543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1994943774 + 1994943775.

It is an arithmetic number, because the mean of its divisors is an integer number (1994943775).

Almost surely, 2^3989887549 is an apocalyptic number.

It is an amenable number.

3989887549 is a deficient number, since it is larger than the sum of its proper divisors (1).

3989887549 is an equidigital number, since it uses as much as digits as its factorization.

3989887549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 156764160, while the sum is 70.

The square root of 3989887549 is about 63165.5566665885. The cubic root of 3989887549 is about 1586.0622134757.

The spelling of 3989887549 in words is "three billion, nine hundred eighty-nine million, eight hundred eighty-seven thousand, five hundred forty-nine".