47936809 has 2 divisors, whose sum is σ = 47936810. Its totient is φ = 47936808.

The previous prime is 47936773. The next prime is 47936813. The reversal of 47936809 is 90863974.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45968400 + 1968409 = 6780^2 + 1403^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47936809 is a prime.

It is not a weakly prime, because it can be changed into another prime (47936869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23968404 + 23968405.

It is an arithmetic number, because the mean of its divisors is an integer number (23968405).

Almost surely, 2^47936809 is an apocalyptic number.

It is an amenable number.

47936809 is a deficient number, since it is larger than the sum of its proper divisors (1).

47936809 is an equidigital number, since it uses as much as digits as its factorization.

47936809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 47936809 is about 6923.6413107555. The cubic root of 47936809 is about 363.2645684375.

The spelling of 47936809 in words is "forty-seven million, nine hundred thirty-six thousand, eight hundred nine".