3987739866 has 16 divisors (see below), whose sum is σ = 8700523488. Its totient is φ = 1208406000.

The previous prime is 3987739841. The next prime is 3987739919. The reversal of 3987739866 is 6689377893.

It is a happy number.

3987739866 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (66), and also a Moran number because the ratio is a prime number: 60420301 = 3987739866 / (3 + 9 + 8 + 7 + 7 + 3 + 9 + 8 + 6 + 6).

It is a junction number, because it is equal to n+sod(n) for n = 3987739797 and 3987739806.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30210085 + ... + 30210216.

It is an arithmetic number, because the mean of its divisors is an integer number (543782718).

Almost surely, 2^3987739866 is an apocalyptic number.

3987739866 is an abundant number, since it is smaller than the sum of its proper divisors (4712783622).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3987739866 is a wasteful number, since it uses less digits than its factorization.

3987739866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60420317.

The product of its digits is 82301184, while the sum is 66.

The square root of 3987739866 is about 63148.5539501895. The cubic root of 3987739866 is about 1585.7775797037. Note that the first 3 decimals are identical.

The spelling of 3987739866 in words is "three billion, nine hundred eighty-seven million, seven hundred thirty-nine thousand, eight hundred sixty-six".