189390985 has 8 divisors (see below), whose sum is σ = 259736256. Its totient is φ = 129868080.

The previous prime is 189390983. The next prime is 189391043. The reversal of 189390985 is 589093981.

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

It is not a de Polignac number, because 189390985 - 2¹ = 189390983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189390983) 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, 2705551 + ... + 2705620.

It is an arithmetic number, because the mean of its divisors is an integer number (32467032).

Almost surely, 2^189390985 is an apocalyptic number.

It is an amenable number.

189390985 is a deficient number, since it is larger than the sum of its proper divisors (70345271).

189390985 is an equidigital number, since it uses as much as digits as its factorization.

189390985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5411183.

The product of its (nonzero) digits is 699840, while the sum is 52.

The square root of 189390985 is about 13761.9397251986. The cubic root of 189390985 is about 574.2748110453.

The spelling of 189390985 in words is "one hundred eighty-nine million, three hundred ninety thousand, nine hundred eighty-five".