189448821 has 16 divisors (see below), whose sum is σ = 282880000. Its totient is φ = 125302464.

The previous prime is 189448813. The next prime is 189448837. The reversal of 189448821 is 128844981.

189448821 is a `hidden beast` number, since 189 + 448 + 8 + 21 = 666.

189448821 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 189448821 - 2³ = 189448813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189448891) 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, 24196 + ... + 31053.

It is an arithmetic number, because the mean of its divisors is an integer number (17680000).

Almost surely, 2^189448821 is an apocalyptic number.

It is an amenable number.

189448821 is a deficient number, since it is larger than the sum of its proper divisors (93431179).

189448821 is a wasteful number, since it uses less digits than its factorization.

189448821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55385 (or 55379 counting only the distinct ones).

The product of its digits is 147456, while the sum is 45.

The square root of 189448821 is about 13764.0408674197. The cubic root of 189448821 is about 574.3332622217. Note that the first 3 decimals are identical.

The spelling of 189448821 in words is "one hundred eighty-nine million, four hundred forty-eight thousand, eight hundred twenty-one".