3904865 has 4 divisors (see below), whose sum is σ = 4685844. Its totient is φ = 3123888.

The previous prime is 3904829. The next prime is 3904877. The reversal of 3904865 is 5684093.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5684093 = 151 ⋅37643.

It can be written as a sum of positive squares in 2 ways, for example, as 1373584 + 2531281 = 1172^2 + 1591^2 .

It is a cyclic number.

It is not a de Polignac number, because 3904865 - 2⁶ = 3904801 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 390482 + ... + 390491.

It is an arithmetic number, because the mean of its divisors is an integer number (1171461).

Almost surely, 2^3904865 is an apocalyptic number.

It is an amenable number.

3904865 is a deficient number, since it is larger than the sum of its proper divisors (780979).

3904865 is an equidigital number, since it uses as much as digits as its factorization.

3904865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780978.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 3904865 is about 1976.0731261773. The cubic root of 3904865 is about 157.4715158029.

The spelling of 3904865 in words is "three million, nine hundred four thousand, eight hundred sixty-five".