189947723 has 4 divisors (see below), whose sum is σ = 217083120. Its totient is φ = 162812328.

The previous prime is 189947699. The next prime is 189947729. The reversal of 189947723 is 327749981.

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

It is not a de Polignac number, because 189947723 - 2⁸ = 189947467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189947729) 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, 13567688 + ... + 13567701.

It is an arithmetic number, because the mean of its divisors is an integer number (54270780).

Almost surely, 2^189947723 is an apocalyptic number.

189947723 is a deficient number, since it is larger than the sum of its proper divisors (27135397).

189947723 is an equidigital number, since it uses as much as digits as its factorization.

189947723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27135396.

The product of its digits is 762048, while the sum is 50.

The square root of 189947723 is about 13782.1523355389. The cubic root of 189947723 is about 574.8369776032.

The spelling of 189947723 in words is "one hundred eighty-nine million, nine hundred forty-seven thousand, seven hundred twenty-three".