47800921 has 24 divisors (see below), whose sum is σ = 57312360. Its totient is φ = 39739392.

The previous prime is 47800919. The next prime is 47800931. The reversal of 47800921 is 12900874.

47800921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 741321 + 47059600 = 861^2 + 6860^2 .

It is not a de Polignac number, because 47800921 - 2¹ = 47800919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47800901) 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 23 ways as a sum of consecutive naturals, for example, 422961 + ... + 423073.

It is an arithmetic number, because the mean of its divisors is an integer number (2388015).

Almost surely, 2^47800921 is an apocalyptic number.

It is an amenable number.

47800921 is a deficient number, since it is larger than the sum of its proper divisors (9511439).

47800921 is a wasteful number, since it uses less digits than its factorization.

47800921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313 (or 306 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 47800921 is about 6913.8210130144. The cubic root of 47800921 is about 362.9209910336.

The spelling of 47800921 in words is "forty-seven million, eight hundred thousand, nine hundred twenty-one".