188764985 has 8 divisors (see below), whose sum is σ = 227161800. Its totient is φ = 150582784.

The previous prime is 188764967. The next prime is 188764993. The reversal of 188764985 is 589467881.

It can be written as a sum of positive squares in 4 ways, for example, as 16289296 + 172475689 = 4036^2 + 13133^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-188764985 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 188764985.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51710 + ... + 55239.

It is an arithmetic number, because the mean of its divisors is an integer number (28395225).

Almost surely, 2^188764985 is an apocalyptic number.

It is an amenable number.

188764985 is a deficient number, since it is larger than the sum of its proper divisors (38396815).

188764985 is a wasteful number, since it uses less digits than its factorization.

188764985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107307.

The product of its digits is 3870720, while the sum is 56.

The square root of 188764985 is about 13739.1770131984. The cubic root of 188764985 is about 573.6413897569.

The spelling of 188764985 in words is "one hundred eighty-eight million, seven hundred sixty-four thousand, nine hundred eighty-five".