188909849 has 2 divisors, whose sum is σ = 188909850. Its totient is φ = 188909848.

The previous prime is 188909843. The next prime is 188909867. The reversal of 188909849 is 948909881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 177076249 + 11833600 = 13307^2 + 3440^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-188909849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 188909794 and 188909803.

It is not a weakly prime, because it can be changed into another prime (188909843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94454924 + 94454925.

It is an arithmetic number, because the mean of its divisors is an integer number (94454925).

Almost surely, 2^188909849 is an apocalyptic number.

It is an amenable number.

188909849 is a deficient number, since it is larger than the sum of its proper divisors (1).

188909849 is an equidigital number, since it uses as much as digits as its factorization.

188909849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1492992, while the sum is 56.

The square root of 188909849 is about 13744.4479336203. The cubic root of 188909849 is about 573.7880955271.

The spelling of 188909849 in words is "one hundred eighty-eight million, nine hundred nine thousand, eight hundred forty-nine".