3981605679 has 8 divisors (see below), whose sum is σ = 5898675120. Its totient is φ = 2654403768.

The previous prime is 3981605671. The next prime is 3981605681. The reversal of 3981605679 is 9765061893.

It is not a de Polignac number, because 3981605679 - 2³ = 3981605671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3981605671) 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, 73733412 + ... + 73733465.

It is an arithmetic number, because the mean of its divisors is an integer number (737334390).

Almost surely, 2^3981605679 is an apocalyptic number.

3981605679 is a deficient number, since it is larger than the sum of its proper divisors (1917069441).

3981605679 is a wasteful number, since it uses less digits than its factorization.

3981605679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147466886 (or 147466880 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 54.

The square root of 3981605679 is about 63099.9657606880. The cubic root of 3981605679 is about 1584.9640488484.

The spelling of 3981605679 in words is "three billion, nine hundred eighty-one million, six hundred five thousand, six hundred seventy-nine".