3638647 has 4 divisors (see below), whose sum is σ = 3662896. Its totient is φ = 3614400.

The previous prime is 3638641. The next prime is 3638651. The reversal of 3638647 is 7468363.

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: 7468363 = 7 ⋅1066909.

It is a cyclic number.

It is not a de Polignac number, because 3638647 - 2³ = 3638639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3638641) 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, 11898 + ... + 12199.

It is an arithmetic number, because the mean of its divisors is an integer number (915724).

Almost surely, 2^3638647 is an apocalyptic number.

3638647 is a deficient number, since it is larger than the sum of its proper divisors (24249).

3638647 is a wasteful number, since it uses less digits than its factorization.

3638647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24248.

The product of its digits is 72576, while the sum is 37.

The square root of 3638647 is about 1907.5237875319. The cubic root of 3638647 is about 153.8083718696.

It can be divided in two parts, 36 and 38647, that added together give a palindrome (38683).

The spelling of 3638647 in words is "three million, six hundred thirty-eight thousand, six hundred forty-seven".