189647729 has 4 divisors (see below), whose sum is σ = 190811376. Its totient is φ = 188484084.

The previous prime is 189647723. The next prime is 189647749. The reversal of 189647729 is 927746981.

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, and also an emirpimes, since its reverse is a distinct semiprime: 927746981 = 7 ⋅132535283.

It is a cyclic number.

It is not a de Polignac number, because 189647729 - 2⁴ = 189647713 is a prime.

It is a super-2 number, since 2×189647729² = 71932522229714882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189647723) 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, 581579 + ... + 581904.

It is an arithmetic number, because the mean of its divisors is an integer number (47702844).

Almost surely, 2^189647729 is an apocalyptic number.

It is an amenable number.

189647729 is a deficient number, since it is larger than the sum of its proper divisors (1163647).

189647729 is a wasteful number, since it uses less digits than its factorization.

189647729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1163646.

The product of its digits is 1524096, while the sum is 53.

The square root of 189647729 is about 13771.2646115017. The cubic root of 189647729 is about 574.5341951563.

The spelling of 189647729 in words is "one hundred eighty-nine million, six hundred forty-seven thousand, seven hundred twenty-nine".