47921538 has 64 divisors (see below), whose sum is σ = 118879488. Its totient is φ = 12564480.

The previous prime is 47921513. The next prime is 47921551. The reversal of 47921538 is 83512974.

47921538 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 47921496 and 47921505.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 28456 + ... + 30092.

It is an arithmetic number, because the mean of its divisors is an integer number (1857492).

Almost surely, 2^47921538 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 47921538, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59439744).

47921538 is an abundant number, since it is smaller than the sum of its proper divisors (70957950).

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

47921538 is a wasteful number, since it uses less digits than its factorization.

47921538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1707.

The product of its digits is 60480, while the sum is 39.

The square root of 47921538 is about 6922.5384072607. The cubic root of 47921538 is about 363.2259898552.

The spelling of 47921538 in words is "forty-seven million, nine hundred twenty-one thousand, five hundred thirty-eight".