189557689 has 4 divisors (see below), whose sum is σ = 189920656. Its totient is φ = 189194724.

The previous prime is 189557677. The next prime is 189557723. The reversal of 189557689 is 986755981.

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 not a de Polignac number, because 189557689 - 2¹³ = 189549497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189557609) 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, 180699 + ... + 181744.

It is an arithmetic number, because the mean of its divisors is an integer number (47480164).

Almost surely, 2^189557689 is an apocalyptic number.

It is an amenable number.

189557689 is a deficient number, since it is larger than the sum of its proper divisors (362967).

189557689 is an equidigital number, since it uses as much as digits as its factorization.

189557689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362966.

The product of its digits is 5443200, while the sum is 58.

The square root of 189557689 is about 13767.9950973263. The cubic root of 189557689 is about 574.4432559393.

The spelling of 189557689 in words is "one hundred eighty-nine million, five hundred fifty-seven thousand, six hundred eighty-nine".