6438366 has 40 divisors (see below), whose sum is σ = 15742584. Its totient is φ = 1950480.

The previous prime is 6438361. The next prime is 6438373. The reversal of 6438366 is 6638346.

6438366 is a `hidden beast` number, since 643 + 8 + 3 + 6 + 6 = 666.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 6438366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6438361) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 25 + ... + 3588.

Almost surely, 2^6438366 is an apocalyptic number.

6438366 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 6438366, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7871292).

6438366 is an abundant number, since it is smaller than the sum of its proper divisors (9304218).

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

6438366 is a wasteful number, since it uses less digits than its factorization.

6438366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3638 (or 3629 counting only the distinct ones).

The product of its digits is 62208, while the sum is 36.

The square root of 6438366 is about 2537.3935445650. The cubic root of 6438366 is about 186.0338127914.

It can be divided in two parts, 643 and 8366, that added together give a palindrome (9009).

The spelling of 6438366 in words is "six million, four hundred thirty-eight thousand, three hundred sixty-six".