3889642689 has 9 divisors (see below), whose sum is σ = 5618643043. Its totient is φ = 2592970392.

The previous prime is 3889642681. The next prime is 3889642711. The reversal of 3889642689 is 9862469883.

The square root of 3889642689 is 62367.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 3435952689 + 453690000 = 58617^2 + 21300^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 3889642689 - 2³ = 3889642681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3889642681) 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 in 8 ways as a sum of consecutive naturals, for example, 176707 + ... + 197495.

Almost surely, 2^3889642689 is an apocalyptic number.

3889642689 is the 62367-th square number.

3889642689 is the 31184-th centered octagonal number.

It is an amenable number.

3889642689 is a deficient number, since it is larger than the sum of its proper divisors (1729000354).

3889642689 is an frugal number, since it uses more digits than its factorization.

3889642689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41584 (or 20792 counting only the distinct ones).

The product of its digits is 35831808, while the sum is 63.

The cubic root of 3889642689 is about 1572.6662592055. Note that the first 3 decimals are identical.

The spelling of 3889642689 in words is "three billion, eight hundred eighty-nine million, six hundred forty-two thousand, six hundred eighty-nine".