189630789 has 4 divisors (see below), whose sum is σ = 252841056. Its totient is φ = 126420524.

The previous prime is 189630769. The next prime is 189630803. The reversal of 189630789 is 987036981.

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 189630789 - 2⁵ = 189630757 is a prime.

It is a super-2 number, since 2×189630789² = 71919672273525042, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189630709) 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, 31605129 + ... + 31605134.

It is an arithmetic number, because the mean of its divisors is an integer number (63210264).

Almost surely, 2^189630789 is an apocalyptic number.

It is an amenable number.

189630789 is a deficient number, since it is larger than the sum of its proper divisors (63210267).

189630789 is an equidigital number, since it uses as much as digits as its factorization.

189630789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63210266.

The product of its (nonzero) digits is 653184, while the sum is 51.

The square root of 189630789 is about 13770.6495489501. The cubic root of 189630789 is about 574.5170881775.

The spelling of 189630789 in words is "one hundred eighty-nine million, six hundred thirty thousand, seven hundred eighty-nine".