189455723 has 2 divisors, whose sum is σ = 189455724. Its totient is φ = 189455722.

The previous prime is 189455719. The next prime is 189455729. The reversal of 189455723 is 327554981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 189455723 - 2² = 189455719 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (189455729) 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 as a sum of consecutive naturals, namely, 94727861 + 94727862.

It is an arithmetic number, because the mean of its divisors is an integer number (94727862).

Almost surely, 2^189455723 is an apocalyptic number.

189455723 is a deficient number, since it is larger than the sum of its proper divisors (1).

189455723 is an equidigital number, since it uses as much as digits as its factorization.

189455723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 302400, while the sum is 44.

The square root of 189455723 is about 13764.2915909247. The cubic root of 189455723 is about 574.3402368407.

The spelling of 189455723 in words is "one hundred eighty-nine million, four hundred fifty-five thousand, seven hundred twenty-three".