189764565 has 16 divisors (see below), whose sum is σ = 305382528. Its totient is φ = 100621376.

The previous prime is 189764551. The next prime is 189764567. The reversal of 189764565 is 565467981.

It is a cyclic number.

It is not a de Polignac number, because 189764565 - 2¹² = 189760469 is a prime.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 33969 + ... + 39158.

It is an arithmetic number, because the mean of its divisors is an integer number (19086408).

Almost surely, 2^189764565 is an apocalyptic number.

189764565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

189764565 is a deficient number, since it is larger than the sum of its proper divisors (115617963).

189764565 is a wasteful number, since it uses less digits than its factorization.

189764565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73308.

The product of its digits is 1814400, while the sum is 51.

The square root of 189764565 is about 13775.5059798179. The cubic root of 189764565 is about 574.6521550839.

The spelling of 189764565 in words is "one hundred eighty-nine million, seven hundred sixty-four thousand, five hundred sixty-five".