47393891 has 4 divisors (see below), whose sum is σ = 47415072. Its totient is φ = 47372712.

The previous prime is 47393887. The next prime is 47393893. The reversal of 47393891 is 19839374.

It is a happy number.

47393891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 47393891 - 2² = 47393887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47393893) 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 3 ways as a sum of consecutive naturals, for example, 6776 + ... + 11861.

It is an arithmetic number, because the mean of its divisors is an integer number (11853768).

Almost surely, 2^47393891 is an apocalyptic number.

47393891 is a deficient number, since it is larger than the sum of its proper divisors (21181).

47393891 is a wasteful number, since it uses less digits than its factorization.

47393891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21180.

The product of its digits is 163296, while the sum is 44.

The square root of 47393891 is about 6884.3221162290. The cubic root of 47393891 is about 361.8879495089.

It can be divided in two parts, 47393 and 891, that added together give a palindrome (48284).

The spelling of 47393891 in words is "forty-seven million, three hundred ninety-three thousand, eight hundred ninety-one".