189721419 has 4 divisors (see below), whose sum is σ = 252961896. Its totient is φ = 126480944.

The previous prime is 189721417. The next prime is 189721439. The reversal of 189721419 is 914127981.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 189721419 - 2¹ = 189721417 is a prime.

It is a super-2 number, since 2×189721419² = 71988433654747122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (189721417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31620234 + ... + 31620239.

It is an arithmetic number, because the mean of its divisors is an integer number (63240474).

Almost surely, 2^189721419 is an apocalyptic number.

189721419 is a deficient number, since it is larger than the sum of its proper divisors (63240477).

189721419 is an equidigital number, since it uses as much as digits as its factorization.

189721419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63240476.

The product of its digits is 36288, while the sum is 42.

The square root of 189721419 is about 13773.9398503115. The cubic root of 189721419 is about 574.6085996723.

The spelling of 189721419 in words is "one hundred eighty-nine million, seven hundred twenty-one thousand, four hundred nineteen".