638622 has 24 divisors (see below), whose sum is σ = 1465776. Its totient is φ = 200256.

The previous prime is 638621. The next prime is 638629. The reversal of 638622 is 226836.

638622 is a `hidden beast` number, since 6 + 38 + 622 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 738 + ... + 1349.

It is an arithmetic number, because the mean of its divisors is an integer number (61074).

2⁶³⁸⁶²² is an apocalyptic number.

638622 is an abundant number, since it is smaller than the sum of its proper divisors (827154).

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

638622 is a wasteful number, since it uses less digits than its factorization.

638622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2112 (or 2109 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 638622 is about 799.1382859055. The cubic root of 638622 is about 86.1154929284.

The spelling of 638622 in words is "six hundred thirty-eight thousand, six hundred twenty-two".