189727645 has 8 divisors (see below), whose sum is σ = 228668760. Its totient is φ = 151118400.

The previous prime is 189727607. The next prime is 189727661. The reversal of 189727645 is 546727981.

It can be written as a sum of positive squares in 4 ways, for example, as 97970404 + 91757241 = 9898^2 + 9579^2 .

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

It is not a de Polignac number, because 189727645 - 2²⁷ = 55509917 is a prime.

It is a congruent number.

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, 81706 + ... + 83995.

It is an arithmetic number, because the mean of its divisors is an integer number (28583595).

Almost surely, 2^189727645 is an apocalyptic number.

It is an amenable number.

189727645 is a deficient number, since it is larger than the sum of its proper divisors (38941115).

189727645 is a wasteful number, since it uses less digits than its factorization.

189727645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165935.

The product of its digits is 846720, while the sum is 49.

The square root of 189727645 is about 13774.1658549620. The cubic root of 189727645 is about 574.6148851583.

The spelling of 189727645 in words is "one hundred eighty-nine million, seven hundred twenty-seven thousand, six hundred forty-five".