638395 has 4 divisors (see below), whose sum is σ = 766080. Its totient is φ = 510712.

The previous prime is 638371. The next prime is 638423. The reversal of 638395 is 593836.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 638395 - 2⁹ = 637883 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 638395.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63835 + ... + 63844.

It is an arithmetic number, because the mean of its divisors is an integer number (191520).

2⁶³⁸³⁹⁵ is an apocalyptic number.

638395 is a deficient number, since it is larger than the sum of its proper divisors (127685).

638395 is a wasteful number, since it uses less digits than its factorization.

638395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127684.

The product of its digits is 19440, while the sum is 34.

The square root of 638395 is about 798.9962452978. The cubic root of 638395 is about 86.1052883873.

The spelling of 638395 in words is "six hundred thirty-eight thousand, three hundred ninety-five".