189008747 has 4 divisors (see below), whose sum is σ = 195526320. Its totient is φ = 182491176.

The previous prime is 189008741. The next prime is 189008783. The reversal of 189008747 is 747800981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 747800981 = 17 ⋅43988293.

It is a cyclic number.

It is not a de Polignac number, because 189008747 - 2⁴ = 189008731 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 189008698 and 189008707.

It is not an unprimeable number, because it can be changed into a prime (189008741) 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, 3258743 + ... + 3258800.

It is an arithmetic number, because the mean of its divisors is an integer number (48881580).

Almost surely, 2^189008747 is an apocalyptic number.

189008747 is a deficient number, since it is larger than the sum of its proper divisors (6517573).

189008747 is an equidigital number, since it uses as much as digits as its factorization.

189008747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6517572.

The product of its (nonzero) digits is 112896, while the sum is 44.

The square root of 189008747 is about 13748.0452065012. The cubic root of 189008747 is about 573.8882078216. Note that the first 3 decimals are identical.

The spelling of 189008747 in words is "one hundred eighty-nine million, eight thousand, seven hundred forty-seven".