188390047 has 2 divisors, whose sum is σ = 188390048. Its totient is φ = 188390046.

The previous prime is 188390029. The next prime is 188390057. The reversal of 188390047 is 740093881.

It is a strong prime.

It is an emirp because it is prime and its reverse (740093881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 188390047 - 2⁷ = 188389919 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 188389991 and 188390009.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (188390017) 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, 94195023 + 94195024.

It is an arithmetic number, because the mean of its divisors is an integer number (94195024).

Almost surely, 2^188390047 is an apocalyptic number.

188390047 is a deficient number, since it is larger than the sum of its proper divisors (1).

188390047 is an equidigital number, since it uses as much as digits as its factorization.

188390047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 188390047 is about 13725.5253815655. The cubic root of 188390047 is about 573.2613360181.

The spelling of 188390047 in words is "one hundred eighty-eight million, three hundred ninety thousand, forty-seven".