638862 has 48 divisors (see below), whose sum is σ = 1551312. Its totient is φ = 174720.

The previous prime is 638861. The next prime is 638893. The reversal of 638862 is 268836.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638861) 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 23 ways as a sum of consecutive naturals, for example, 12028 + ... + 12080.

It is an arithmetic number, because the mean of its divisors is an integer number (32319).

2⁶³⁸⁸⁶² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 638862, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (775656).

638862 is an abundant number, since it is smaller than the sum of its proper divisors (912450).

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

638862 is a wasteful number, since it uses less digits than its factorization.

638862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113 (or 106 counting only the distinct ones).

The product of its digits is 13824, while the sum is 33.

The square root of 638862 is about 799.2884335457. The cubic root of 638862 is about 86.1262792412.

The spelling of 638862 in words is "six hundred thirty-eight thousand, eight hundred sixty-two".