189389723 has 4 divisors (see below), whose sum is σ = 192963168. Its totient is φ = 185816280.

The previous prime is 189389699. The next prime is 189389773. The reversal of 189389723 is 327983981.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189389723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189389773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1786643 + ... + 1786748.

It is an arithmetic number, because the mean of its divisors is an integer number (48240792).

Almost surely, 2^189389723 is an apocalyptic number.

189389723 is a deficient number, since it is larger than the sum of its proper divisors (3573445).

189389723 is an equidigital number, since it uses as much as digits as its factorization.

189389723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3573444.

The product of its digits is 653184, while the sum is 50.

The square root of 189389723 is about 13761.8938740277. The cubic root of 189389723 is about 574.2735354893.

The spelling of 189389723 in words is "one hundred eighty-nine million, three hundred eighty-nine thousand, seven hundred twenty-three".