189921006 has 48 divisors (see below), whose sum is σ = 453396528. Its totient is φ = 56976000.

The previous prime is 189921001. The next prime is 189921013. The reversal of 189921006 is 600129981.

189921006 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189921001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15250 + ... + 24746.

It is an arithmetic number, because the mean of its divisors is an integer number (9445761).

Almost surely, 2^189921006 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 189921006, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (226698264).

189921006 is an abundant number, since it is smaller than the sum of its proper divisors (263475522).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

189921006 is a wasteful number, since it uses less digits than its factorization.

189921006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9617 (or 9614 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 189921006 is about 13781.1830406537. The cubic root of 189921006 is about 574.8100252057.

The spelling of 189921006 in words is "one hundred eighty-nine million, nine hundred twenty-one thousand, six".