47437921 has 2 divisors, whose sum is σ = 47437922. Its totient is φ = 47437920.

The previous prime is 47437919. The next prime is 47437961. The reversal of 47437921 is 12973474.

47437921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36784225 + 10653696 = 6065^2 + 3264^2 .

It is a cyclic number.

It is not a de Polignac number, because 47437921 - 2¹ = 47437919 is a prime.

Together with 47437919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (47437961) 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 as a sum of consecutive naturals, namely, 23718960 + 23718961.

It is an arithmetic number, because the mean of its divisors is an integer number (23718961).

Almost surely, 2^47437921 is an apocalyptic number.

It is an amenable number.

47437921 is a deficient number, since it is larger than the sum of its proper divisors (1).

47437921 is an equidigital number, since it uses as much as digits as its factorization.

47437921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 37.

The square root of 47437921 is about 6887.5192195739. The cubic root of 47437921 is about 361.9999821943. Note that the first 4 decimals are identical.

The spelling of 47437921 in words is "forty-seven million, four hundred thirty-seven thousand, nine hundred twenty-one".