47391 has 4 divisors (see below), whose sum is σ = 63192. Its totient is φ = 31592.

The previous prime is 47389. The next prime is 47407. The reversal of 47391 is 19374.

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 47391 - 2¹ = 47389 is a prime.

It is a D-number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 47391.

It is not an unprimeable number, because it can be changed into a prime (47351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7896 + ... + 7901.

It is an arithmetic number, because the mean of its divisors is an integer number (15798).

2⁴⁷³⁹¹ is an apocalyptic number.

47391 is a deficient number, since it is larger than the sum of its proper divisors (15801).

47391 is a wasteful number, since it uses less digits than its factorization.

47391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15800.

The product of its digits is 756, while the sum is 24.

The square root of 47391 is about 217.6947404050. The cubic root of 47391 is about 36.1880591041.

The spelling of 47391 in words is "forty-seven thousand, three hundred ninety-one".