47684809 has 2 divisors, whose sum is σ = 47684810. Its totient is φ = 47684808.

The previous prime is 47684801. The next prime is 47684821. The reversal of 47684809 is 90848674.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25857225 + 21827584 = 5085^2 + 4672^2 .

It is a cyclic number.

It is not a de Polignac number, because 47684809 - 2³ = 47684801 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (47684801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23842404 + 23842405.

It is an arithmetic number, because the mean of its divisors is an integer number (23842405).

Almost surely, 2^47684809 is an apocalyptic number.

It is an amenable number.

47684809 is a deficient number, since it is larger than the sum of its proper divisors (1).

47684809 is an equidigital number, since it uses as much as digits as its factorization.

47684809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 387072, while the sum is 46.

The square root of 47684809 is about 6905.4188142357. The cubic root of 47684809 is about 362.6268987349.

The spelling of 47684809 in words is "forty-seven million, six hundred eighty-four thousand, eight hundred nine".