3939805 has 8 divisors (see below), whose sum is σ = 4771800. Its totient is φ = 3122496.

The previous prime is 3939791. The next prime is 3939811. The reversal of 3939805 is 5089393.

It can be written as a sum of positive squares in 4 ways, for example, as 1996569 + 1943236 = 1413^2 + 1394^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3939805 - 2⁵ = 3939773 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3070 + ... + 4159.

It is an arithmetic number, because the mean of its divisors is an integer number (596475).

Almost surely, 2^3939805 is an apocalyptic number.

It is an amenable number.

3939805 is a deficient number, since it is larger than the sum of its proper divisors (831995).

3939805 is a wasteful number, since it uses less digits than its factorization.

3939805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7343.

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 3939805 is about 1984.8942037298. The cubic root of 3939805 is about 157.9397970712.

The spelling of 3939805 in words is "three million, nine hundred thirty-nine thousand, eight hundred five".