189811947 has 8 divisors (see below), whose sum is σ = 272550544. Its totient is φ = 116807328.

The previous prime is 189811927. The next prime is 189811949. The reversal of 189811947 is 749118981.

189811947 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 189811947 - 2⁶ = 189811883 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 189811896 and 189811905.

It is not an unprimeable number, because it can be changed into a prime (189811949) 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, 2433448 + ... + 2433525.

It is an arithmetic number, because the mean of its divisors is an integer number (34068818).

Almost surely, 2^189811947 is an apocalyptic number.

189811947 is a deficient number, since it is larger than the sum of its proper divisors (82738597).

189811947 is a wasteful number, since it uses less digits than its factorization.

189811947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4866989.

The product of its digits is 145152, while the sum is 48.

The square root of 189811947 is about 13777.2256641169. The cubic root of 189811947 is about 574.6999790854.

The spelling of 189811947 in words is "one hundred eighty-nine million, eight hundred eleven thousand, nine hundred forty-seven".