638022 has 32 divisors (see below), whose sum is σ = 1592064. Its totient is φ = 165600.

The previous prime is 637939. The next prime is 638023. The reversal of 638022 is 220836.

638022 is nontrivially palindromic in base 15.

638022 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 638022.

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 638022.

It is not an unprimeable number, because it can be changed into a prime (638023) 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, 229 + ... + 1152.

It is an arithmetic number, because the mean of its divisors is an integer number (49752).

2⁶³⁸⁰²² is an apocalyptic number.

638022 is an abundant number, since it is smaller than the sum of its proper divisors (954042).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638022 is a wasteful number, since it uses less digits than its factorization.

638022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1404.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 638022 is about 798.7627933248. The cubic root of 638022 is about 86.0885153185.

Adding to 638022 its reverse (220836), we get a palindrome (858858).

The spelling of 638022 in words is "six hundred thirty-eight thousand, twenty-two".