47838509 has 2 divisors, whose sum is σ = 47838510. Its totient is φ = 47838508.

The previous prime is 47838503. The next prime is 47838541. The reversal of 47838509 is 90583874.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40921609 + 6916900 = 6397^2 + 2630^2 .

It is a cyclic number.

It is not a de Polignac number, because 47838509 - 2⁸ = 47838253 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 47838509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47838503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23919254 + 23919255.

It is an arithmetic number, because the mean of its divisors is an integer number (23919255).

Almost surely, 2^47838509 is an apocalyptic number.

It is an amenable number.

47838509 is a deficient number, since it is larger than the sum of its proper divisors (1).

47838509 is an equidigital number, since it uses as much as digits as its factorization.

47838509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 47838509 is about 6916.5388020310. The cubic root of 47838509 is about 363.0160931073.

The spelling of 47838509 in words is "forty-seven million, eight hundred thirty-eight thousand, five hundred nine".