47905991 has 8 divisors (see below), whose sum is σ = 54924960. Its totient is φ = 40930848.

The previous prime is 47905981. The next prime is 47906003. The reversal of 47905991 is 19950974.

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

It is not a de Polignac number, because 47905991 - 2⁶ = 47905927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47905951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8576 + ... + 13013.

It is an arithmetic number, because the mean of its divisors is an integer number (6865620).

Almost surely, 2^47905991 is an apocalyptic number.

47905991 is a deficient number, since it is larger than the sum of its proper divisors (7018969).

47905991 is a wasteful number, since it uses less digits than its factorization.

47905991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21913.

The product of its (nonzero) digits is 102060, while the sum is 44.

The square root of 47905991 is about 6921.4153899329. The cubic root of 47905991 is about 363.1867056036.

The spelling of 47905991 in words is "forty-seven million, nine hundred five thousand, nine hundred ninety-one".