189205638 has 16 divisors (see below), whose sum is σ = 382971456. Its totient is φ = 62308520.

The previous prime is 189205637. The next prime is 189205649. The reversal of 189205638 is 836502981.

It is a self number, because there is not a number n which added to its sum of digits gives 189205638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189205637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189468 + ... + 190463.

It is an arithmetic number, because the mean of its divisors is an integer number (23935716).

Almost surely, 2^189205638 is an apocalyptic number.

189205638 is an abundant number, since it is smaller than the sum of its proper divisors (193765818).

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

189205638 is a wasteful number, since it uses less digits than its factorization.

189205638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380019.

The product of its (nonzero) digits is 103680, while the sum is 42.

The square root of 189205638 is about 13755.2040333831. The cubic root of 189205638 is about 574.0874123777.

The spelling of 189205638 in words is "one hundred eighty-nine million, two hundred five thousand, six hundred thirty-eight".