3975865 has 8 divisors (see below), whose sum is σ = 4818888. Its totient is φ = 3148800.

The previous prime is 3975863. The next prime is 3975887. The reversal of 3975865 is 5685793.

It can be written as a sum of positive squares in 4 ways, for example, as 369664 + 3606201 = 608^2 + 1899^2 .

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

It is not a de Polignac number, because 3975865 - 2¹ = 3975863 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3975863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3432 + ... + 4441.

It is an arithmetic number, because the mean of its divisors is an integer number (602361).

Almost surely, 2^3975865 is an apocalyptic number.

It is an amenable number.

3975865 is a deficient number, since it is larger than the sum of its proper divisors (843023).

3975865 is a wasteful number, since it uses less digits than its factorization.

3975865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7979.

The product of its digits is 226800, while the sum is 43.

The square root of 3975865 is about 1993.9571209031. The cubic root of 3975865 is about 158.4201948753.

The spelling of 3975865 in words is "three million, nine hundred seventy-five thousand, eight hundred sixty-five".