189188473 has 4 divisors (see below), whose sum is σ = 193802868. Its totient is φ = 184574080.

The previous prime is 189188459. The next prime is 189188513. The reversal of 189188473 is 374881981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 374881981 = 317 ⋅1182593.

It can be written as a sum of positive squares in 2 ways, for example, as 102475129 + 86713344 = 10123^2 + 9312^2 .

It is a cyclic number.

It is not a de Polignac number, because 189188473 - 2²¹ = 187091321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189188423) 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, 2307136 + ... + 2307217.

It is an arithmetic number, because the mean of its divisors is an integer number (48450717).

Almost surely, 2^189188473 is an apocalyptic number.

It is an amenable number.

189188473 is a deficient number, since it is larger than the sum of its proper divisors (4614395).

189188473 is an equidigital number, since it uses as much as digits as its factorization.

189188473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4614394.

The product of its digits is 387072, while the sum is 49.

The square root of 189188473 is about 13754.5800735610. The cubic root of 189188473 is about 574.0700511818.

The spelling of 189188473 in words is "one hundred eighty-nine million, one hundred eighty-eight thousand, four hundred seventy-three".