189291745 has 4 divisors (see below), whose sum is σ = 227150100. Its totient is φ = 151433392.

The previous prime is 189291733. The next prime is 189291749. The reversal of 189291745 is 547192981.

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 133356304 + 55935441 = 11548^2 + 7479^2 .

It is a cyclic number.

It is not a de Polignac number, because 189291745 - 2⁹ = 189291233 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 189291695 and 189291704.

It is not an unprimeable number, because it can be changed into a prime (189291749) 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, 18929170 + ... + 18929179.

It is an arithmetic number, because the mean of its divisors is an integer number (56787525).

Almost surely, 2^189291745 is an apocalyptic number.

It is an amenable number.

189291745 is a deficient number, since it is larger than the sum of its proper divisors (37858355).

189291745 is an equidigital number, since it uses as much as digits as its factorization.

189291745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37858354.

The product of its digits is 181440, while the sum is 46.

The square root of 189291745 is about 13758.3336563699. Note that the first 3 decimals coincide. The cubic root of 189291745 is about 574.1744877388.

It can be divided in two parts, 189291 and 745, that added together give a triangular number (190036 = T₆₁₆).

The spelling of 189291745 in words is "one hundred eighty-nine million, two hundred ninety-one thousand, seven hundred forty-five".