189853638 has 64 divisors (see below), whose sum is σ = 431488512. Its totient is φ = 55249920.

The previous prime is 189853627. The next prime is 189853709. The reversal of 189853638 is 836358981.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 173473 + ... + 174563.

It is an arithmetic number, because the mean of its divisors is an integer number (6742008).

Almost surely, 2^189853638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 189853638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (215744256).

189853638 is an abundant number, since it is smaller than the sum of its proper divisors (241634874).

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

189853638 is a wasteful number, since it uses less digits than its factorization.

189853638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1229.

The product of its digits is 1244160, while the sum is 51.

The square root of 189853638 is about 13778.7386215139. The cubic root of 189853638 is about 574.7420524168.

The spelling of 189853638 in words is "one hundred eighty-nine million, eight hundred fifty-three thousand, six hundred thirty-eight".