47218639 has 8 divisors (see below), whose sum is σ = 53842320. Its totient is φ = 41022336.

The previous prime is 47218631. The next prime is 47218643. The reversal of 47218639 is 93681274.

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 47218639 - 2³ = 47218631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47218631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106609 + ... + 107050.

It is an arithmetic number, because the mean of its divisors is an integer number (6730290).

Almost surely, 2^47218639 is an apocalyptic number.

47218639 is a deficient number, since it is larger than the sum of its proper divisors (6623681).

47218639 is a wasteful number, since it uses less digits than its factorization.

47218639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213689.

The product of its digits is 72576, while the sum is 40.

The square root of 47218639 is about 6871.5819867044. The cubic root of 47218639 is about 361.4413383563.

The spelling of 47218639 in words is "forty-seven million, two hundred eighteen thousand, six hundred thirty-nine".