3639647 has 4 divisors (see below), whose sum is σ = 3970536. Its totient is φ = 3308760.

The previous prime is 3639637. The next prime is 3639661. The reversal of 3639647 is 7469363.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7469363 = 11 ⋅679033.

It is a cyclic number.

It is not a de Polignac number, because 3639647 - 2⁴ = 3639631 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3639647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3639637) 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, 165428 + ... + 165449.

It is an arithmetic number, because the mean of its divisors is an integer number (992634).

Almost surely, 2^3639647 is an apocalyptic number.

3639647 is a deficient number, since it is larger than the sum of its proper divisors (330889).

3639647 is a wasteful number, since it uses less digits than its factorization.

3639647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330888.

The product of its digits is 81648, while the sum is 38.

The square root of 3639647 is about 1907.7858894541. The cubic root of 3639647 is about 153.8224608321.

The spelling of 3639647 in words is "three million, six hundred thirty-nine thousand, six hundred forty-seven".