3906681 has 4 divisors (see below), whose sum is σ = 5208912. Its totient is φ = 2604452.

The previous prime is 3906667. The next prime is 3906691. The reversal of 3906681 is 1866093.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3906681 - 2⁹ = 3906169 is a prime.

It is a super-2 number, since 2×3906681² = 30524312871522, which contains 22 as substring.

It is a D-number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3906601) 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, 651111 + ... + 651116.

It is an arithmetic number, because the mean of its divisors is an integer number (1302228).

Almost surely, 2^3906681 is an apocalyptic number.

It is an amenable number.

3906681 is a deficient number, since it is larger than the sum of its proper divisors (1302231).

3906681 is a wasteful number, since it uses less digits than its factorization.

3906681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302230.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 3906681 is about 1976.5325699315. The cubic root of 3906681 is about 157.4959233009.

The spelling of 3906681 in words is "three million, nine hundred six thousand, six hundred eighty-one".