3958609 has 4 divisors (see below), whose sum is σ = 3963060. Its totient is φ = 3954160.

The previous prime is 3958601. The next prime is 3958621. The reversal of 3958609 is 9068593.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9068593 = 233 ⋅38921.

It can be written as a sum of positive squares in 2 ways, for example, as 3598609 + 360000 = 1897^2 + 600^2 .

It is a cyclic number.

It is not a de Polignac number, because 3958609 - 2³ = 3958601 is a prime.

It is a Duffinian number.

3958609 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3958601) 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, 382 + ... + 2839.

It is an arithmetic number, because the mean of its divisors is an integer number (990765).

Almost surely, 2^3958609 is an apocalyptic number.

It is an amenable number.

3958609 is a deficient number, since it is larger than the sum of its proper divisors (4451).

3958609 is a wasteful number, since it uses less digits than its factorization.

3958609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4450.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 3958609 is about 1989.6253416159. The cubic root of 3958609 is about 158.1906713738.

The spelling of 3958609 in words is "three million, nine hundred fifty-eight thousand, six hundred nine".