188320729 has 3 divisors (see below), whose sum is σ = 188334453. Its totient is φ = 188307006.

The previous prime is 188320703. The next prime is 188320733. The reversal of 188320729 is 927023881.

The square root of 188320729 is 13723.

It is a perfect power (a square), and thus also a powerful 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 is not a de Polignac number, because 188320729 - 2⁵ = 188320697 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 188320691 and 188320700.

It is not an unprimeable number, because it can be changed into a prime (188320129) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 6862 + ... + 20584.

It is an arithmetic number, because the mean of its divisors is an integer number (62778151).

Almost surely, 2^188320729 is an apocalyptic number.

188320729 is the 13723-rd square number.

188320729 is the 6862-nd centered octagonal number.

It is an amenable number.

188320729 is a deficient number, since it is larger than the sum of its proper divisors (13724).

188320729 is an frugal number, since it uses more digits than its factorization.

188320729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27446 (or 13723 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The cubic root of 188320729 is about 573.1910170094.

The spelling of 188320729 in words is "one hundred eighty-eight million, three hundred twenty thousand, seven hundred twenty-nine".