189738640 has 160 divisors (see below), whose sum is σ = 552464640. Its totient is φ = 59000832.

The previous prime is 189738623. The next prime is 189738643. The reversal of 189738640 is 46837981.

It is a happy number.

189738640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (189738643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 487566 + ... + 487954.

It is an arithmetic number, because the mean of its divisors is an integer number (3452904).

Almost surely, 2^189738640 is an apocalyptic number.

189738640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 189738640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (276232320).

189738640 is an abundant number, since it is smaller than the sum of its proper divisors (362726000).

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

189738640 is a wasteful number, since it uses less digits than its factorization.

189738640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489 (or 483 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 189738640 is about 13774.5649659073. The cubic root of 189738640 is about 574.6259848738.

The spelling of 189738640 in words is "one hundred eighty-nine million, seven hundred thirty-eight thousand, six hundred forty".