188943985 has 4 divisors (see below), whose sum is σ = 226732788. Its totient is φ = 151155184.

The previous prime is 188943983. The next prime is 188943991. The reversal of 188943985 is 589349881.

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 51022449 + 137921536 = 7143^2 + 11744^2 .

It is a cyclic number.

It is not a de Polignac number, because 188943985 - 2¹ = 188943983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (188943983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18894394 + ... + 18894403.

It is an arithmetic number, because the mean of its divisors is an integer number (56683197).

Almost surely, 2^188943985 is an apocalyptic number.

It is an amenable number.

188943985 is a deficient number, since it is larger than the sum of its proper divisors (37788803).

188943985 is an equidigital number, since it uses as much as digits as its factorization.

188943985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37788802.

The product of its digits is 2488320, while the sum is 55.

The square root of 188943985 is about 13745.6896880440. The cubic root of 188943985 is about 573.8226546054.

The spelling of 188943985 in words is "one hundred eighty-eight million, nine hundred forty-three thousand, nine hundred eighty-five".