3986811681 has 8 divisors (see below), whose sum is σ = 5332519104. Its totient is φ = 2649489360.

The previous prime is 3986811677. The next prime is 3986811691. The reversal of 3986811681 is 1861186893.

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

It is not a de Polignac number, because 3986811681 - 2² = 3986811677 is a prime.

It is a super-2 number, since 2×3986811681² = 31789334759516091522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3986811601) 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 7 ways as a sum of consecutive naturals, for example, 2095165 + ... + 2097066.

It is an arithmetic number, because the mean of its divisors is an integer number (666564888).

Almost surely, 2^3986811681 is an apocalyptic number.

It is an amenable number.

3986811681 is a deficient number, since it is larger than the sum of its proper divisors (1345707423).

3986811681 is a wasteful number, since it uses less digits than its factorization.

3986811681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4192551.

The product of its digits is 497664, while the sum is 51.

The square root of 3986811681 is about 63141.2043043210. The cubic root of 3986811681 is about 1585.6545351366.

The spelling of 3986811681 in words is "three billion, nine hundred eighty-six million, eight hundred eleven thousand, six hundred eighty-one".