3820681 has 4 divisors (see below), whose sum is σ = 3863700. Its totient is φ = 3777664.

The previous prime is 3820673. The next prime is 3820709. The reversal of 3820681 is 1860283.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1860283 = 103 ⋅18061.

It can be written as a sum of positive squares in 2 ways, for example, as 210681 + 3610000 = 459^2 + 1900^2 .

It is a cyclic number.

It is not a de Polignac number, because 3820681 - 2³ = 3820673 is a prime.

It is a super-2 number, since 2×3820681² = 29195206607522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3820651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21376 + ... + 21553.

It is an arithmetic number, because the mean of its divisors is an integer number (965925).

Almost surely, 2^3820681 is an apocalyptic number.

It is an amenable number.

3820681 is a deficient number, since it is larger than the sum of its proper divisors (43019).

3820681 is an equidigital number, since it uses as much as digits as its factorization.

3820681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43018.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 3820681 is about 1954.6562357612. The cubic root of 3820681 is about 156.3316552401.

The spelling of 3820681 in words is "three million, eight hundred twenty thousand, six hundred eighty-one".