47921784 has 64 divisors (see below), whose sum is σ = 126766080. Its totient is φ = 15072000.

The previous prime is 47921777. The next prime is 47921789. The reversal of 47921784 is 48712974.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47921789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29719 + ... + 31289.

It is an arithmetic number, because the mean of its divisors is an integer number (1980720).

Almost surely, 2^47921784 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 47921784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63383040).

47921784 is an abundant number, since it is smaller than the sum of its proper divisors (78844296).

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

47921784 is a wasteful number, since it uses less digits than its factorization.

47921784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1652 (or 1648 counting only the distinct ones).

The product of its digits is 112896, while the sum is 42.

The square root of 47921784 is about 6922.5561752867. The cubic root of 47921784 is about 363.2266113812.

The spelling of 47921784 in words is "forty-seven million, nine hundred twenty-one thousand, seven hundred eighty-four".