8443638 has 48 divisors (see below), whose sum is σ = 22014720. Its totient is φ = 2284848.

The previous prime is 8443637. The next prime is 8443639. The reversal of 8443638 is 8363448.

8443638 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (8443637) and next prime (8443639).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8443637) 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, 631 + ... + 4157.

It is an arithmetic number, because the mean of its divisors is an integer number (458640).

Almost surely, 2^8443638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8443638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11007360).

8443638 is an abundant number, since it is smaller than the sum of its proper divisors (13571082).

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

8443638 is a wasteful number, since it uses less digits than its factorization.

8443638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3561 (or 3558 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The square root of 8443638 is about 2905.7938674311. The cubic root of 8443638 is about 203.6306754871.

The spelling of 8443638 in words is "eight million, four hundred forty-three thousand, six hundred thirty-eight".