47778187 has 2 divisors, whose sum is σ = 47778188. Its totient is φ = 47778186.

The previous prime is 47778139. The next prime is 47778193. The reversal of 47778187 is 78187774.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 47778187 - 2¹⁵ = 47745419 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 47778187.

It is not a weakly prime, because it can be changed into another prime (47778127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23889093 + 23889094.

It is an arithmetic number, because the mean of its divisors is an integer number (23889094).

Almost surely, 2^47778187 is an apocalyptic number.

47778187 is a deficient number, since it is larger than the sum of its proper divisors (1).

47778187 is an equidigital number, since it uses as much as digits as its factorization.

47778187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 614656, while the sum is 49.

The square root of 47778187 is about 6912.1767193844. The cubic root of 47778187 is about 362.8634471343.

The spelling of 47778187 in words is "forty-seven million, seven hundred seventy-eight thousand, one hundred eighty-seven".