189805423 has 2 divisors, whose sum is σ = 189805424. Its totient is φ = 189805422.

The previous prime is 189805409. The next prime is 189805433. The reversal of 189805423 is 324508981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 189805423 - 2⁹ = 189804911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189805433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94902711 + 94902712.

It is an arithmetic number, because the mean of its divisors is an integer number (94902712).

Almost surely, 2^189805423 is an apocalyptic number.

189805423 is a deficient number, since it is larger than the sum of its proper divisors (1).

189805423 is an equidigital number, since it uses as much as digits as its factorization.

189805423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 189805423 is about 13776.9888945299. The cubic root of 189805423 is about 574.6933946990.

The spelling of 189805423 in words is "one hundred eighty-nine million, eight hundred five thousand, four hundred twenty-three".