3809866681 has 16 divisors (see below), whose sum is σ = 4091523840. Its totient is φ = 3536507520.

The previous prime is 3809866667. The next prime is 3809866729. The reversal of 3809866681 is 1866689083.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 3809866681 - 2⁹ = 3809866169 is a prime.

It is a super-2 number, since 2×3809866681² = 29030168253987911522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3809866631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 915301 + ... + 919453.

It is an arithmetic number, because the mean of its divisors is an integer number (255720240).

Almost surely, 2^3809866681 is an apocalyptic number.

It is an amenable number.

3809866681 is a deficient number, since it is larger than the sum of its proper divisors (281657159).

3809866681 is a wasteful number, since it uses less digits than its factorization.

3809866681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5136.

The product of its (nonzero) digits is 2985984, while the sum is 55.

The square root of 3809866681 is about 61724.1174987541. The cubic root of 3809866681 is about 1561.8401855912.

The spelling of 3809866681 in words is "three billion, eight hundred nine million, eight hundred sixty-six thousand, six hundred eighty-one".