189921005 has 16 divisors (see below), whose sum is σ = 239410944. Its totient is φ = 144355200.

The previous prime is 189921001. The next prime is 189921013. The reversal of 189921005 is 500129981.

It is not a de Polignac number, because 189921005 - 2² = 189921001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189921001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11897 + ... + 22833.

It is an arithmetic number, because the mean of its divisors is an integer number (14963184).

Almost surely, 2^189921005 is an apocalyptic number.

It is an amenable number.

189921005 is a deficient number, since it is larger than the sum of its proper divisors (49489939).

189921005 is a wasteful number, since it uses less digits than its factorization.

189921005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11116.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 189921005 is about 13781.1830043723. The cubic root of 189921005 is about 574.8100241968.

The spelling of 189921005 in words is "one hundred eighty-nine million, nine hundred twenty-one thousand, five".