47918721 has 8 divisors (see below), whose sum is σ = 64351840. Its totient is φ = 31715712.

The previous prime is 47918719. The next prime is 47918723. The reversal of 47918721 is 12781974.

47918721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (47918719) and next prime (47918723).

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

It is not a de Polignac number, because 47918721 - 2¹ = 47918719 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 47918721.

It is not an unprimeable number, because it can be changed into a prime (47918723) 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 7 ways as a sum of consecutive naturals, for example, 57040 + ... + 57873.

It is an arithmetic number, because the mean of its divisors is an integer number (8043980).

Almost surely, 2^47918721 is an apocalyptic number.

It is an amenable number.

47918721 is a deficient number, since it is larger than the sum of its proper divisors (16433119).

47918721 is a wasteful number, since it uses less digits than its factorization.

47918721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115055.

The product of its digits is 28224, while the sum is 39.

The square root of 47918721 is about 6922.3349384438. The cubic root of 47918721 is about 363.2188724733.

The spelling of 47918721 in words is "forty-seven million, nine hundred eighteen thousand, seven hundred twenty-one".