189649945 has 4 divisors (see below), whose sum is σ = 227579940. Its totient is φ = 151719952.

The previous prime is 189649939. The next prime is 189649949. The reversal of 189649945 is 549946981.

189649945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 149352841 + 40297104 = 12221^2 + 6348^2 .

It is a cyclic number.

It is not a de Polignac number, because 189649945 - 2¹⁵ = 189617177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (189649949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18964990 + ... + 18964999.

It is an arithmetic number, because the mean of its divisors is an integer number (56894985).

Almost surely, 2^189649945 is an apocalyptic number.

It is an amenable number.

189649945 is a deficient number, since it is larger than the sum of its proper divisors (37929995).

189649945 is an equidigital number, since it uses as much as digits as its factorization.

189649945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37929994.

The product of its digits is 2799360, while the sum is 55.

The square root of 189649945 is about 13771.3450686561. The cubic root of 189649945 is about 574.5364329242.

The spelling of 189649945 in words is "one hundred eighty-nine million, six hundred forty-nine thousand, nine hundred forty-five".