3865609 has 8 divisors (see below), whose sum is σ = 4307328. Its totient is φ = 3438960.

The previous prime is 3865601. The next prime is 3865637. The reversal of 3865609 is 9065683.

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 3865609 - 2³ = 3865601 is a prime.

It is a Duffinian number.

It is a plaindrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (3865601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3222 + ... + 4255.

It is an arithmetic number, because the mean of its divisors is an integer number (538416).

Almost surely, 2^3865609 is an apocalyptic number.

It is an amenable number.

3865609 is a deficient number, since it is larger than the sum of its proper divisors (441719).

3865609 is a wasteful number, since it uses less digits than its factorization.

3865609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7535.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 3865609 is about 1966.1152051698. The cubic root of 3865609 is about 156.9420452246.

It can be divided in two parts, 386 and 5609, that added together give a palindrome (5995).

The spelling of 3865609 in words is "three million, eight hundred sixty-five thousand, six hundred nine".