189966765 has 16 divisors (see below), whose sum is σ = 304170048. Its totient is φ = 101241216.

The previous prime is 189966761. The next prime is 189966811. The reversal of 189966765 is 567669981.

It is a happy number.

It is not a de Polignac number, because 189966765 - 2² = 189966761 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189966761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21034 + ... + 28676.

It is an arithmetic number, because the mean of its divisors is an integer number (19010628).

Almost surely, 2^189966765 is an apocalyptic number.

189966765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

189966765 is a deficient number, since it is larger than the sum of its proper divisors (114203283).

189966765 is a wasteful number, since it uses less digits than its factorization.

189966765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9308.

The product of its digits is 4898880, while the sum is 57.

The square root of 189966765 is about 13782.8431392075. The cubic root of 189966765 is about 574.8561858356.

The spelling of 189966765 in words is "one hundred eighty-nine million, nine hundred sixty-six thousand, seven hundred sixty-five".