189938851 has 4 divisors (see below), whose sum is σ = 190117600. Its totient is φ = 189760104.

The previous prime is 189938813. The next prime is 189938857. The reversal of 189938851 is 158839981.

189938851 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 189938851 - 2⁹ = 189938339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189938857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87771 + ... + 89908.

It is an arithmetic number, because the mean of its divisors is an integer number (47529400).

Almost surely, 2^189938851 is an apocalyptic number.

189938851 is a deficient number, since it is larger than the sum of its proper divisors (178749).

189938851 is a wasteful number, since it uses less digits than its factorization.

189938851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178748.

The product of its digits is 622080, while the sum is 52.

The square root of 189938851 is about 13781.8304662334. The cubic root of 189938851 is about 574.8280277143.

The spelling of 189938851 in words is "one hundred eighty-nine million, nine hundred thirty-eight thousand, eight hundred fifty-one".