47581993 has 12 divisors (see below), whose sum is σ = 49967760. Its totient is φ = 45298440.

The previous prime is 47581987. The next prime is 47582039. The reversal of 47581993 is 39918574.

It is a happy number.

It is not a de Polignac number, because 47581993 - 2⁹ = 47581481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47581903) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64018 + ... + 64756.

It is an arithmetic number, because the mean of its divisors is an integer number (4163980).

Almost surely, 2^47581993 is an apocalyptic number.

It is an amenable number.

47581993 is a deficient number, since it is larger than the sum of its proper divisors (2385767).

47581993 is an equidigital number, since it uses as much as digits as its factorization.

47581993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868 (or 837 counting only the distinct ones).

The product of its digits is 272160, while the sum is 46.

The square root of 47581993 is about 6897.9702086918. The cubic root of 47581993 is about 362.3660841849.

The spelling of 47581993 in words is "forty-seven million, five hundred eighty-one thousand, nine hundred ninety-three".