47705809 has 8 divisors (see below), whose sum is σ = 49036160. Its totient is φ = 46393776.

The previous prime is 47705803. The next prime is 47705821. The reversal of 47705809 is 90850774.

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 47705809 - 2⁹ = 47705297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47705803) 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, 787 + ... + 9799.

It is an arithmetic number, because the mean of its divisors is an integer number (6129520).

Almost surely, 2^47705809 is an apocalyptic number.

It is an amenable number.

47705809 is a deficient number, since it is larger than the sum of its proper divisors (1330351).

47705809 is an equidigital number, since it uses as much as digits as its factorization.

47705809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9159.

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 47705809 is about 6906.9391918563. The cubic root of 47705809 is about 362.6801235628.

The spelling of 47705809 in words is "forty-seven million, seven hundred five thousand, eight hundred nine".