189727621 has 8 divisors (see below), whose sum is σ = 198123840. Its totient is φ = 181343712.

The previous prime is 189727607. The next prime is 189727661. The reversal of 189727621 is 126727981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189727621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189727661) 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 7 ways as a sum of consecutive naturals, for example, 43770 + ... + 47908.

It is an arithmetic number, because the mean of its divisors is an integer number (24765480).

Almost surely, 2^189727621 is an apocalyptic number.

It is an amenable number.

189727621 is a deficient number, since it is larger than the sum of its proper divisors (8396219).

189727621 is a wasteful number, since it uses less digits than its factorization.

189727621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6155.

The product of its digits is 84672, while the sum is 43.

The square root of 189727621 is about 13774.1649837658. The cubic root of 189727621 is about 574.6148609293.

The spelling of 189727621 in words is "one hundred eighty-nine million, seven hundred twenty-seven thousand, six hundred twenty-one".