47924721 has 24 divisors (see below), whose sum is σ = 75053160. Its totient is φ = 29293056.

The previous prime is 47924699. The next prime is 47924741. The reversal of 47924721 is 12742974.

It can be written as a sum of positive squares in 4 ways, for example, as 314721 + 47610000 = 561^2 + 6900^2 .

It is not a de Polignac number, because 47924721 - 2⁵ = 47924689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (47924741) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17065 + ... + 19673.

It is an arithmetic number, because the mean of its divisors is an integer number (3127215).

Almost surely, 2^47924721 is an apocalyptic number.

It is an amenable number.

47924721 is a deficient number, since it is larger than the sum of its proper divisors (27128439).

47924721 is a wasteful number, since it uses less digits than its factorization.

47924721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2785 (or 2782 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 47924721 is about 6922.7683046596. The cubic root of 47924721 is about 363.2340316305.

It can be divided in two parts, 479 and 24721, that added together give a triangular number (25200 = T₂₂₄).

The spelling of 47924721 in words is "forty-seven million, nine hundred twenty-four thousand, seven hundred twenty-one".