47731945 has 8 divisors (see below), whose sum is σ = 57318336. Its totient is φ = 38158896.

The previous prime is 47731927. The next prime is 47731949. The reversal of 47731945 is 54913774.

47731945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 47731945 - 2⁹ = 47731433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 47731898 and 47731907.

It is not an unprimeable number, because it can be changed into a prime (47731949) 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 7 ways as a sum of consecutive naturals, for example, 8124 + ... + 12706.

It is an arithmetic number, because the mean of its divisors is an integer number (7164792).

Almost surely, 2^47731945 is an apocalyptic number.

It is an amenable number.

47731945 is a deficient number, since it is larger than the sum of its proper divisors (9586391).

47731945 is a wasteful number, since it uses less digits than its factorization.

47731945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6671.

The product of its digits is 105840, while the sum is 40.

The square root of 47731945 is about 6908.8309430757. The cubic root of 47731945 is about 362.7463438505.

The spelling of 47731945 in words is "forty-seven million, seven hundred thirty-one thousand, nine hundred forty-five".