47987993 has 2 divisors, whose sum is σ = 47987994. Its totient is φ = 47987992.

The previous prime is 47987921. The next prime is 47988007. The reversal of 47987993 is 39978974.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26708224 + 21279769 = 5168^2 + 4613^2 .

It is a cyclic number.

It is not a de Polignac number, because 47987993 - 2¹⁸ = 47725849 is a prime.

It is not a weakly prime, because it can be changed into another prime (47987903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23993996 + 23993997.

It is an arithmetic number, because the mean of its divisors is an integer number (23993997).

Almost surely, 2^47987993 is an apocalyptic number.

It is an amenable number.

47987993 is a deficient number, since it is larger than the sum of its proper divisors (1).

47987993 is an equidigital number, since it uses as much as digits as its factorization.

47987993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3429216, while the sum is 56.

The square root of 47987993 is about 6927.3366454937. The cubic root of 47987993 is about 363.3938130297.

The spelling of 47987993 in words is "forty-seven million, nine hundred eighty-seven thousand, nine hundred ninety-three".