42661218 has 8 divisors (see below), whose sum is σ = 85322448. Its totient is φ = 14220404.

The previous prime is 42661207. The next prime is 42661243. The reversal of 42661218 is 81216624.

42661218 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

42661218 is an admirable number.

It is a super-3 number, since 3×42661218³ (a number of 24 digits) contains 333 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3555096 + ... + 3555107.

It is an arithmetic number, because the mean of its divisors is an integer number (10665306).

Almost surely, 2^42661218 is an apocalyptic number.

42661218 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

42661218 is a wasteful number, since it uses less digits than its factorization.

42661218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7110208.

The product of its digits is 4608, while the sum is 30.

The square root of 42661218 is about 6531.5555574457. Note that the first 5 decimals coincide. The cubic root of 42661218 is about 349.4173107339.

The spelling of 42661218 in words is "forty-two million, six hundred sixty-one thousand, two hundred eighteen".