189660689 has 4 divisors (see below), whose sum is σ = 190050624. Its totient is φ = 189270756.

The previous prime is 189660671. The next prime is 189660701. The reversal of 189660689 is 986066981.

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 189660689 - 2⁸ = 189660433 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 189660689.

It is not an unprimeable number, because it can be changed into a prime (189660649) 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, 194237 + ... + 195210.

It is an arithmetic number, because the mean of its divisors is an integer number (47512656).

Almost surely, 2^189660689 is an apocalyptic number.

It is an amenable number.

189660689 is a deficient number, since it is larger than the sum of its proper divisors (389935).

189660689 is an equidigital number, since it uses as much as digits as its factorization.

189660689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389934.

The product of its (nonzero) digits is 1119744, while the sum is 53.

The square root of 189660689 is about 13771.7351484844. The cubic root of 189660689 is about 574.5472822162.

The spelling of 189660689 in words is "one hundred eighty-nine million, six hundred sixty thousand, six hundred eighty-nine".