3904681 has 4 divisors (see below), whose sum is σ = 4259664. Its totient is φ = 3549700.

The previous prime is 3904673. The next prime is 3904699. The reversal of 3904681 is 1864093.

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 not a de Polignac number, because 3904681 - 2³ = 3904673 is a prime.

It is a super-2 number, since 2×3904681² = 30493067423522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3904631) 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, 177475 + ... + 177496.

It is an arithmetic number, because the mean of its divisors is an integer number (1064916).

Almost surely, 2^3904681 is an apocalyptic number.

It is an amenable number.

3904681 is a deficient number, since it is larger than the sum of its proper divisors (354983).

3904681 is a wasteful number, since it uses less digits than its factorization.

3904681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354982.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 3904681 is about 1976.0265686473. The cubic root of 3904681 is about 157.4690423744.

The spelling of 3904681 in words is "three million, nine hundred four thousand, six hundred eighty-one".