47727809 has 2 divisors, whose sum is σ = 47727810. Its totient is φ = 47727808.

The previous prime is 47727793. The next prime is 47727811. The reversal of 47727809 is 90872774.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46881409 + 846400 = 6847^2 + 920^2 .

It is a cyclic number.

It is not a de Polignac number, because 47727809 - 2⁴ = 47727793 is a prime.

Together with 47727811, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 47727809.

It is not a weakly prime, because it can be changed into another prime (47727839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23863904 + 23863905.

It is an arithmetic number, because the mean of its divisors is an integer number (23863905).

Almost surely, 2^47727809 is an apocalyptic number.

It is an amenable number.

47727809 is a deficient number, since it is larger than the sum of its proper divisors (1).

47727809 is an equidigital number, since it uses as much as digits as its factorization.

47727809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 197568, while the sum is 44.

The square root of 47727809 is about 6908.5316095390. The cubic root of 47727809 is about 362.7358661559.

The spelling of 47727809 in words is "forty-seven million, seven hundred twenty-seven thousand, eight hundred nine".