42218442 has 64 divisors (see below), whose sum is σ = 108887040. Its totient is φ = 11875248.

The previous prime is 42218441. The next prime is 42218459. The reversal of 42218442 is 24481224.

42218442 is a `hidden beast` number, since 4 + 2 + 218 + 442 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42218441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24493 + ... + 26159.

It is an arithmetic number, because the mean of its divisors is an integer number (1701360).

Almost surely, 2^42218442 is an apocalyptic number.

42218442 is a gapful number since it is divisible by the number (42) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 42218442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54443520).

42218442 is an abundant number, since it is smaller than the sum of its proper divisors (66668598).

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

42218442 is a wasteful number, since it uses less digits than its factorization.

42218442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1752 (or 1746 counting only the distinct ones).

The product of its digits is 4096, while the sum is 27.

The square root of 42218442 is about 6497.5720080658. The cubic root of 42218442 is about 348.2042498950.

Adding to 42218442 its reverse (24481224), we get a palindrome (66699666).

The spelling of 42218442 in words is "forty-two million, two hundred eighteen thousand, four hundred forty-two".