6618438 has 48 divisors (see below), whose sum is σ = 15350400. Its totient is φ = 2056320.

The previous prime is 6618433. The next prime is 6618463. The reversal of 6618438 is 8348166.

It is a happy number.

6618438 is a `hidden beast` number, since 6 + 618 + 4 + 38 = 666.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6618433) 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, 15978 + ... + 16386.

It is an arithmetic number, because the mean of its divisors is an integer number (319800).

Almost surely, 2^6618438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6618438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7675200).

6618438 is an abundant number, since it is smaller than the sum of its proper divisors (8731962).

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

6618438 is a wasteful number, since it uses less digits than its factorization.

6618438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477 (or 474 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 6618438 is about 2572.6325038761. The cubic root of 6618438 is about 187.7522577998.

It can be divided in two parts, 6618 and 438, that added together give a square (7056 = 84²).

The spelling of 6618438 in words is "six million, six hundred eighteen thousand, four hundred thirty-eight".