189817423 has 2 divisors, whose sum is σ = 189817424. Its totient is φ = 189817422.

The previous prime is 189817417. The next prime is 189817451. The reversal of 189817423 is 324718981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 189817423 - 2¹³ = 189809231 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 189817423.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189817483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94908711 + 94908712.

It is an arithmetic number, because the mean of its divisors is an integer number (94908712).

Almost surely, 2^189817423 is an apocalyptic number.

189817423 is a deficient number, since it is larger than the sum of its proper divisors (1).

189817423 is an equidigital number, since it uses as much as digits as its factorization.

189817423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 43.

The square root of 189817423 is about 13777.4243964538. The cubic root of 189817423 is about 574.7055056551.

It can be divided in two parts, 1898 and 17423, that added together give a square (19321 = 139²).

The spelling of 189817423 in words is "one hundred eighty-nine million, eight hundred seventeen thousand, four hundred twenty-three".