3975805 has 4 divisors (see below), whose sum is σ = 4770972. Its totient is φ = 3180640.

The previous prime is 3975791. The next prime is 3975827. The reversal of 3975805 is 5085793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5085793 = 283 ⋅17971.

It can be written as a sum of positive squares in 2 ways, for example, as 2365444 + 1610361 = 1538^2 + 1269^2 .

It is not a de Polignac number, because 3975805 - 2⁷ = 3975677 is a prime.

It is a Duffinian number.

It is a congruent 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, 397576 + ... + 397585.

It is an arithmetic number, because the mean of its divisors is an integer number (1192743).

Almost surely, 2^3975805 is an apocalyptic number.

It is an amenable number.

3975805 is a deficient number, since it is larger than the sum of its proper divisors (795167).

3975805 is an equidigital number, since it uses as much as digits as its factorization.

3975805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795166.

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 3975805 is about 1993.9420753873. The cubic root of 3975805 is about 158.4193979619.

The spelling of 3975805 in words is "three million, nine hundred seventy-five thousand, eight hundred five".