3986945889 has 4 divisors (see below), whose sum is σ = 5315927856. Its totient is φ = 2657963924.

The previous prime is 3986945861. The next prime is 3986945951. The reversal of 3986945889 is 9885496893.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9885496893 = 3 ⋅3295165631.

It is a cyclic number.

It is not a de Polignac number, because 3986945889 - 2¹⁶ = 3986880353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3986943889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 664490979 + ... + 664490984.

It is an arithmetic number, because the mean of its divisors is an integer number (1328981964).

Almost surely, 2^3986945889 is an apocalyptic number.

It is an amenable number.

3986945889 is a deficient number, since it is larger than the sum of its proper divisors (1328981967).

3986945889 is a wasteful number, since it uses less digits than its factorization.

3986945889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1328981966.

The product of its digits is 134369280, while the sum is 69.

The square root of 3986945889 is about 63142.2670562279. The cubic root of 3986945889 is about 1585.6723275609.

It can be divided in two parts, 39869 and 45889, that added together give a palindrome (85758).

The spelling of 3986945889 in words is "three billion, nine hundred eighty-six million, nine hundred forty-five thousand, eight hundred eighty-nine".