3638225 has 12 divisors (see below), whose sum is σ = 4536540. Its totient is φ = 2894400.

The previous prime is 3638213. The next prime is 3638227. The reversal of 3638225 is 5228363.

It can be written as a sum of positive squares in 6 ways, for example, as 707281 + 2930944 = 841^2 + 1712^2 .

It is not a de Polignac number, because 3638225 - 2¹² = 3634129 is a prime.

It is a d-powerful number, because it can be written as 3⁶ + 6⁸ + 3⁷ + 8 + 2⁹ + 2¹¹ + 5⁹ .

It is not an unprimeable number, because it can be changed into a prime (3638227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6455 + ... + 6995.

It is an arithmetic number, because the mean of its divisors is an integer number (378045).

Almost surely, 2^3638225 is an apocalyptic number.

It is an amenable number.

3638225 is a deficient number, since it is larger than the sum of its proper divisors (898315).

3638225 is a wasteful number, since it uses less digits than its factorization.

3638225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820 (or 815 counting only the distinct ones).

The product of its digits is 8640, while the sum is 29.

The square root of 3638225 is about 1907.4131697144. The cubic root of 3638225 is about 153.8024255529.

The spelling of 3638225 in words is "three million, six hundred thirty-eight thousand, two hundred twenty-five".