3989889869 has 4 divisors (see below), whose sum is σ = 4559874144. Its totient is φ = 3419905596.

The previous prime is 3989889863. The next prime is 3989889877. The reversal of 3989889869 is 9689889893.

3989889869 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 3989889869 - 2¹² = 3989885773 is a prime.

It is a super-2 number, since 2×3989889869² = 31838442333497674322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3989889869.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3989889863) 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, 284992127 + ... + 284992140.

It is an arithmetic number, because the mean of its divisors is an integer number (1139968536).

Almost surely, 2^3989889869 is an apocalyptic number.

It is an amenable number.

3989889869 is a deficient number, since it is larger than the sum of its proper divisors (569984275).

3989889869 is an equidigital number, since it uses as much as digits as its factorization.

3989889869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569984274.

The product of its digits is 483729408, while the sum is 77.

The square root of 3989889869 is about 63165.5750310246. The cubic root of 3989889869 is about 1586.0625208915.

The spelling of 3989889869 in words is "three billion, nine hundred eighty-nine million, eight hundred eighty-nine thousand, eight hundred sixty-nine".