188957009 has 4 divisors (see below), whose sum is σ = 189406260. Its totient is φ = 188507760.

The previous prime is 188957003. The next prime is 188957089. The reversal of 188957009 is 900759881.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27793984 + 161163025 = 5272^2 + 12695^2 .

It is a cyclic number.

It is not a de Polignac number, because 188957009 - 2¹⁶ = 188891473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (188957003) 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 in 3 ways as a sum of consecutive naturals, for example, 223994 + ... + 224835.

It is an arithmetic number, because the mean of its divisors is an integer number (47351565).

Almost surely, 2^188957009 is an apocalyptic number.

It is an amenable number.

188957009 is a deficient number, since it is larger than the sum of its proper divisors (449251).

188957009 is an equidigital number, since it uses as much as digits as its factorization.

188957009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449250.

The product of its (nonzero) digits is 181440, while the sum is 47.

The square root of 188957009 is about 13746.1634283898. The cubic root of 188957009 is about 573.8358389265.

The spelling of 188957009 in words is "one hundred eighty-eight million, nine hundred fifty-seven thousand, nine".