638361 has 24 divisors (see below), whose sum is σ = 995904. Its totient is φ = 408240.

The previous prime is 638359. The next prime is 638371. The reversal of 638361 is 163836.

It is not a de Polignac number, because 638361 - 2¹ = 638359 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

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

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 638361.

It is not an unprimeable number, because it can be changed into a prime (638371) 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, 8956 + ... + 9026.

It is an arithmetic number, because the mean of its divisors is an integer number (41496).

2⁶³⁸³⁶¹ is an apocalyptic number.

It is an amenable number.

638361 is a deficient number, since it is larger than the sum of its proper divisors (357543).

638361 is an equidigital number, since it uses as much as digits as its factorization.

638361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123 (or 111 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 638361 is about 798.9749683188. The cubic root of 638361 is about 86.1037597455.

It can be divided in two parts, 638 and 361, that added together give a palindrome (999).

The spelling of 638361 in words is "six hundred thirty-eight thousand, three hundred sixty-one".