189423005 has 4 divisors (see below), whose sum is σ = 227307612. Its totient is φ = 151538400.

The previous prime is 189423001. The next prime is 189423029. The reversal of 189423005 is 500324981.

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

It can be written as a sum of positive squares in 2 ways, for example, as 150945796 + 38477209 = 12286^2 + 6203^2 .

It is not a de Polignac number, because 189423005 - 2² = 189423001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189423001) 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, 18942296 + ... + 18942305.

It is an arithmetic number, because the mean of its divisors is an integer number (56826903).

Almost surely, 2^189423005 is an apocalyptic number.

It is an amenable number.

189423005 is a deficient number, since it is larger than the sum of its proper divisors (37884607).

189423005 is an equidigital number, since it uses as much as digits as its factorization.

189423005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37884606.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 189423005 is about 13763.1030294770. The cubic root of 189423005 is about 574.3071730983.

Adding to 189423005 its reverse (500324981), we get a palindrome (689747986).

The spelling of 189423005 in words is "one hundred eighty-nine million, four hundred twenty-three thousand, five".