3851681 has 4 divisors (see below), whose sum is σ = 3876372. Its totient is φ = 3826992.

The previous prime is 3851677. The next prime is 3851689. The reversal of 3851681 is 1861583.

3851681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 462400 + 3389281 = 680^2 + 1841^2 .

It is a cyclic number.

It is not a de Polignac number, because 3851681 - 2² = 3851677 is a prime.

It is a super-2 number, since 2×3851681² = 29670893051522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3851689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12110 + ... + 12423.

It is an arithmetic number, because the mean of its divisors is an integer number (969093).

Almost surely, 2^3851681 is an apocalyptic number.

It is an amenable number.

3851681 is a deficient number, since it is larger than the sum of its proper divisors (24691).

3851681 is a wasteful number, since it uses less digits than its factorization.

3851681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24690.

The product of its digits is 5760, while the sum is 32.

The square root of 3851681 is about 1962.5699987516. The cubic root of 3851681 is about 156.7533281414.

The spelling of 3851681 in words is "three million, eight hundred fifty-one thousand, six hundred eighty-one".