189881670 has 144 divisors (see below), whose sum is σ = 535049424. Its totient is φ = 43084800.

The previous prime is 189881663. The next prime is 189881683. The reversal of 189881670 is 76188981.

189881670 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1048980 + ... + 1049160.

It is an arithmetic number, because the mean of its divisors is an integer number (3715621).

Almost surely, 2^189881670 is an apocalyptic number.

189881670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 189881670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (267524712).

189881670 is an abundant number, since it is smaller than the sum of its proper divisors (345167754).

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

189881670 is a wasteful number, since it uses less digits than its factorization.

189881670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 48.

The square root of 189881670 is about 13779.7558033515. The cubic root of 189881670 is about 574.7703380241.

The spelling of 189881670 in words is "one hundred eighty-nine million, eight hundred eighty-one thousand, six hundred seventy".