188509045 has 4 divisors (see below), whose sum is σ = 226210860. Its totient is φ = 150807232.

The previous prime is 188509007. The next prime is 188509063. The reversal of 188509045 is 540905881.

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 149646289 + 38862756 = 12233^2 + 6234^2 .

It is a cyclic number.

It is not a de Polignac number, because 188509045 - 2⁷ = 188508917 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 188508989 and 188509007.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 18850900 + ... + 18850909.

It is an arithmetic number, because the mean of its divisors is an integer number (56552715).

Almost surely, 2^188509045 is an apocalyptic number.

It is an amenable number.

188509045 is a deficient number, since it is larger than the sum of its proper divisors (37701815).

188509045 is an equidigital number, since it uses as much as digits as its factorization.

188509045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37701814.

The product of its (nonzero) digits is 57600, while the sum is 40.

The square root of 188509045 is about 13729.8596132663. The cubic root of 188509045 is about 573.3820122345.

The spelling of 188509045 in words is "one hundred eighty-eight million, five hundred nine thousand, forty-five".