638925 has 24 divisors (see below), whose sum is σ = 1208256. Its totient is φ = 291840.

The previous prime is 638923. The next prime is 638933. The reversal of 638925 is 529836.

It is a happy number.

It is not a de Polignac number, because 638925 - 2¹ = 638923 is a prime.

It is an alternating number because its digits alternate between even and odd.

638925 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638923) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 84 + ... + 1133.

It is an arithmetic number, because the mean of its divisors is an integer number (50344).

2⁶³⁸⁹²⁵ is an apocalyptic number.

It is an amenable number.

638925 is a deficient number, since it is larger than the sum of its proper divisors (569331).

638925 is a wasteful number, since it uses less digits than its factorization.

638925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1237 (or 1232 counting only the distinct ones).

The product of its digits is 12960, while the sum is 33.

The square root of 638925 is about 799.3278426278. The cubic root of 638925 is about 86.1291102006.

The spelling of 638925 in words is "six hundred thirty-eight thousand, nine hundred twenty-five".