189000905 has 8 divisors (see below), whose sum is σ = 228533184. Its totient is φ = 150046000.

The previous prime is 189000901. The next prime is 189000907. The reversal of 189000905 is 509000981.

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

It is not a de Polignac number, because 189000905 - 2² = 189000901 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189000901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143621 + ... + 144930.

It is an arithmetic number, because the mean of its divisors is an integer number (28566648).

Almost surely, 2^189000905 is an apocalyptic number.

It is an amenable number.

189000905 is a deficient number, since it is larger than the sum of its proper divisors (39532279).

189000905 is a wasteful number, since it uses less digits than its factorization.

189000905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288687.

The product of its (nonzero) digits is 3240, while the sum is 32.

The square root of 189000905 is about 13747.7599993599. The cubic root of 189000905 is about 573.8802708105.

The spelling of 189000905 in words is "one hundred eighty-nine million, nine hundred five", and thus it is an aban number.