3638638 has 8 divisors (see below), whose sum is σ = 5508360. Its totient is φ = 1802520.

The previous prime is 3638573. The next prime is 3638639. The reversal of 3638638 is 8368363.

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

It is a junction number, because it is equal to n+sod(n) for n = 3638597 and 3638606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3638639) 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 3 ways as a sum of consecutive naturals, for example, 8128 + ... + 8563.

It is an arithmetic number, because the mean of its divisors is an integer number (688545).

Almost surely, 2^3638638 is an apocalyptic number.

3638638 is a deficient number, since it is larger than the sum of its proper divisors (1869722).

3638638 is a wasteful number, since it uses less digits than its factorization.

3638638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16802.

The product of its digits is 62208, while the sum is 37.

The square root of 3638638 is about 1907.5214284511. The cubic root of 3638638 is about 153.8082450572.

The spelling of 3638638 in words is "three million, six hundred thirty-eight thousand, six hundred thirty-eight".