3981635651839 has 8 divisors (see below), whose sum is σ = 4094619344928. Its totient is φ = 3869407703040.

The previous prime is 3981635651797. The next prime is 3981635651911. The reversal of 3981635651839 is 9381565361893.

3981635651839 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3981635651839 - 2¹¹ = 3981635649791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3981635654839) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188925387 + ... + 188946460.

It is an arithmetic number, because the mean of its divisors is an integer number (511827418116).

Almost surely, 2^{3981635651839} is an apocalyptic number.

3981635651839 is a deficient number, since it is larger than the sum of its proper divisors (112983693089).

3981635651839 is a wasteful number, since it uses less digits than its factorization.

3981635651839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377872145.

The product of its digits is 125971200, while the sum is 67.

The spelling of 3981635651839 in words is "three trillion, nine hundred eighty-one billion, six hundred thirty-five million, six hundred fifty-one thousand, eight hundred thirty-nine".