189847729 has 4 divisors (see below), whose sum is σ = 191213680. Its totient is φ = 188481780.

The previous prime is 189847673. The next prime is 189847739. The reversal of 189847729 is 927748981.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189847729 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 189847729.

It is not an unprimeable number, because it can be changed into a prime (189847739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 682767 + ... + 683044.

It is an arithmetic number, because the mean of its divisors is an integer number (47803420).

Almost surely, 2^189847729 is an apocalyptic number.

It is an amenable number.

189847729 is a deficient number, since it is larger than the sum of its proper divisors (1365951).

189847729 is a wasteful number, since it uses less digits than its factorization.

189847729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1365950.

The product of its digits is 2032128, while the sum is 55.

The square root of 189847729 is about 13778.5241952830. The cubic root of 189847729 is about 574.7360896024.

The spelling of 189847729 in words is "one hundred eighty-nine million, eight hundred forty-seven thousand, seven hundred twenty-nine".