638895 has 16 divisors (see below), whose sum is σ = 1032192. Its totient is φ = 337440.

The previous prime is 638893. The next prime is 638923. The reversal of 638895 is 598836.

It is not a de Polignac number, because 638895 - 2¹ = 638893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2754 + ... + 2976.

It is an arithmetic number, because the mean of its divisors is an integer number (64512).

2⁶³⁸⁸⁹⁵ is an apocalyptic number.

638895 is a deficient number, since it is larger than the sum of its proper divisors (393297).

638895 is a wasteful number, since it uses less digits than its factorization.

638895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422.

The product of its digits is 51840, while the sum is 39.

The square root of 638895 is about 799.3090766406. The cubic root of 638895 is about 86.1277621479.

The spelling of 638895 in words is "six hundred thirty-eight thousand, eight hundred ninety-five".