189764563 has 4 divisors (see below), whose sum is σ = 190813168. Its totient is φ = 188715960.

The previous prime is 189764551. The next prime is 189764567. The reversal of 189764563 is 365467981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 365467981 = 37 ⋅9877513.

It is a cyclic number.

It is not a de Polignac number, because 189764563 - 2¹⁷ = 189633491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189764567) 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, 524031 + ... + 524392.

It is an arithmetic number, because the mean of its divisors is an integer number (47703292).

Almost surely, 2^189764563 is an apocalyptic number.

189764563 is a deficient number, since it is larger than the sum of its proper divisors (1048605).

189764563 is a wasteful number, since it uses less digits than its factorization.

189764563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1048604.

The product of its digits is 1088640, while the sum is 49.

The square root of 189764563 is about 13775.5059072253. The cubic root of 189764563 is about 574.6521530651.

The spelling of 189764563 in words is "one hundred eighty-nine million, seven hundred sixty-four thousand, five hundred sixty-three".