189287729 has 4 divisors (see below), whose sum is σ = 189315876. Its totient is φ = 189259584.

The previous prime is 189287701. The next prime is 189287731. The reversal of 189287729 is 927782981.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 14440000 + 174847729 = 3800^2 + 13223^2 .

It is a cyclic number.

It is not a de Polignac number, because 189287729 - 2⁸ = 189287473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189287779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2597 + ... + 19629.

It is an arithmetic number, because the mean of its divisors is an integer number (47328969).

Almost surely, 2^189287729 is an apocalyptic number.

It is an amenable number.

189287729 is a deficient number, since it is larger than the sum of its proper divisors (28147).

189287729 is a wasteful number, since it uses less digits than its factorization.

189287729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28146.

The product of its digits is 1016064, while the sum is 53.

The square root of 189287729 is about 13758.1877076888. The cubic root of 189287729 is about 574.1704271620.

The spelling of 189287729 in words is "one hundred eighty-nine million, two hundred eighty-seven thousand, seven hundred twenty-nine".