47930809 has 2 divisors, whose sum is σ = 47930810. Its totient is φ = 47930808.

The previous prime is 47930807. The next prime is 47930821. The reversal of 47930809 is 90803974.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36336784 + 11594025 = 6028^2 + 3405^2 .

It is a cyclic number.

It is not a de Polignac number, because 47930809 - 2¹ = 47930807 is a prime.

Together with 47930807, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (47930807) 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 as a sum of consecutive naturals, namely, 23965404 + 23965405.

It is an arithmetic number, because the mean of its divisors is an integer number (23965405).

Almost surely, 2^47930809 is an apocalyptic number.

It is an amenable number.

47930809 is a deficient number, since it is larger than the sum of its proper divisors (1).

47930809 is an equidigital number, since it uses as much as digits as its factorization.

47930809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 47930809 is about 6923.2079991865. The cubic root of 47930809 is about 363.2494118290.

The spelling of 47930809 in words is "forty-seven million, nine hundred thirty thousand, eight hundred nine".