638225 has 18 divisors (see below), whose sum is σ = 922374. Its totient is φ = 436800.

The previous prime is 638201. The next prime is 638233. The reversal of 638225 is 522836.

638225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 12544 + 625681 = 112^2 + 791^2 .

It is not a de Polignac number, because 638225 - 2⁶ = 638161 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 638194 and 638203.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 965 + ... + 1485.

It is an arithmetic number, because the mean of its divisors is an integer number (51243).

2⁶³⁸²²⁵ is an apocalyptic number.

It is an amenable number.

638225 is a deficient number, since it is larger than the sum of its proper divisors (284149).

638225 is a wasteful number, since it uses less digits than its factorization.

638225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545 (or 533 counting only the distinct ones).

The product of its digits is 2880, while the sum is 26.

The square root of 638225 is about 798.8898547359. The cubic root of 638225 is about 86.0976446356.

The spelling of 638225 in words is "six hundred thirty-eight thousand, two hundred twenty-five".