189664845 has 16 divisors (see below), whose sum is σ = 304829952. Its totient is φ = 100699200.

The previous prime is 189664841. The next prime is 189664861. The reversal of 189664845 is 548466981.

189664845 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 189664845 - 2² = 189664841 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189664841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25006 + ... + 31695.

It is an arithmetic number, because the mean of its divisors is an integer number (19051872).

Almost surely, 2^189664845 is an apocalyptic number.

189664845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

189664845 is a deficient number, since it is larger than the sum of its proper divisors (115165107).

189664845 is a wasteful number, since it uses less digits than its factorization.

189664845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56932.

The product of its digits is 1658880, while the sum is 51.

The square root of 189664845 is about 13771.8860364149. The cubic root of 189664845 is about 574.5514788354.

The spelling of 189664845 in words is "one hundred eighty-nine million, six hundred sixty-four thousand, eight hundred forty-five".