189975638 has 16 divisors (see below), whose sum is σ = 294329376. Its totient is φ = 91915200.

The previous prime is 189975637. The next prime is 189975641. The reversal of 189975638 is 836579981.

189975638 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 not an unprimeable number, because it can be changed into a prime (189975637) 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, 4538 + ... + 20013.

It is an arithmetic number, because the mean of its divisors is an integer number (18395586).

Almost surely, 2^189975638 is an apocalyptic number.

189975638 is a deficient number, since it is larger than the sum of its proper divisors (104353738).

189975638 is a wasteful number, since it uses less digits than its factorization.

189975638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24679.

The product of its digits is 3265920, while the sum is 56.

The square root of 189975638 is about 13783.1650211408. The cubic root of 189975638 is about 574.8651358564.

The spelling of 189975638 in words is "one hundred eighty-nine million, nine hundred seventy-five thousand, six hundred thirty-eight".