3989873869 has 4 divisors (see below), whose sum is σ = 3990675420. Its totient is φ = 3989072320.

The previous prime is 3989873861. The next prime is 3989873891. The reversal of 3989873869 is 9683789893.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1897909225 + 2091964644 = 43565^2 + 45738^2 .

It is a cyclic number.

It is not a de Polignac number, because 3989873869 - 2³ = 3989873861 is a prime.

It is a super-2 number, since 2×3989873869² = 31838186981058058322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3989873798 and 3989873807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3989873861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 393262 + ... + 403279.

It is an arithmetic number, because the mean of its divisors is an integer number (997668855).

Almost surely, 2^3989873869 is an apocalyptic number.

It is an amenable number.

3989873869 is a deficient number, since it is larger than the sum of its proper divisors (801551).

3989873869 is an equidigital number, since it uses as much as digits as its factorization.

3989873869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801550.

The product of its digits is 141087744, while the sum is 70.

The square root of 3989873869 is about 63165.4483796324. The cubic root of 3989873869 is about 1586.0604007800.

The spelling of 3989873869 in words is "three billion, nine hundred eighty-nine million, eight hundred seventy-three thousand, eight hundred sixty-nine".