42218005 has 8 divisors (see below), whose sum is σ = 50799672. Its totient is φ = 33682368.

The previous prime is 42217991. The next prime is 42218081. The reversal of 42218005 is 50081224.

It can be written as a sum of positive squares in 4 ways, for example, as 2047761 + 40170244 = 1431^2 + 6338^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42218005 - 2⁹ = 42217493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9454 + ... + 13183.

It is an arithmetic number, because the mean of its divisors is an integer number (6349959).

Almost surely, 2^42218005 is an apocalyptic number.

It is an amenable number.

42218005 is a deficient number, since it is larger than the sum of its proper divisors (8581667).

42218005 is a wasteful number, since it uses less digits than its factorization.

42218005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23015.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 42218005 is about 6497.5383800329. The cubic root of 42218005 is about 348.2030484787.

Adding to 42218005 its reverse (50081224), we get a palindrome (92299229).

The spelling of 42218005 in words is "forty-two million, two hundred eighteen thousand, five".