189667985 has 8 divisors (see below), whose sum is σ = 245109480. Its totient is φ = 140062464.

The previous prime is 189667939. The next prime is 189667993. The reversal of 189667985 is 589766981.

It is a Cunningham number, because it is equal to 13772²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 28047616 + 161620369 = 5296^2 + 12713^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 189667985 - 2¹² = 189663889 is a prime.

It is an unprimeable number.

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, 1458920 + ... + 1459049.

It is an arithmetic number, because the mean of its divisors is an integer number (30638685).

Almost surely, 2^189667985 is an apocalyptic number.

It is an amenable number.

189667985 is a deficient number, since it is larger than the sum of its proper divisors (55441495).

189667985 is a wasteful number, since it uses less digits than its factorization.

189667985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2917987.

The product of its digits is 6531840, while the sum is 59.

The square root of 189667985 is about 13772.0000363055. Note that the first 4 decimals coincide. The cubic root of 189667985 is about 574.5546494839.

The spelling of 189667985 in words is "one hundred eighty-nine million, six hundred sixty-seven thousand, nine hundred eighty-five".