47857218 has 8 divisors (see below), whose sum is σ = 95714448. Its totient is φ = 15952404.

The previous prime is 47857217. The next prime is 47857231. The reversal of 47857218 is 81275874.

47857218 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.

47857218 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 47857218.

It is not an unprimeable number, because it can be changed into a prime (47857217) 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 3 ways as a sum of consecutive naturals, for example, 3988096 + ... + 3988107.

It is an arithmetic number, because the mean of its divisors is an integer number (11964306).

Almost surely, 2^47857218 is an apocalyptic number.

47857218 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.

47857218 is a wasteful number, since it uses less digits than its factorization.

47857218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7976208.

The product of its digits is 125440, while the sum is 42.

The square root of 47857218 is about 6917.8911526563. The cubic root of 47857218 is about 363.0634105164.

The spelling of 47857218 in words is "forty-seven million, eight hundred fifty-seven thousand, two hundred eighteen".