194493985 has 12 divisors (see below), whose sum is σ = 271498068. Its totient is φ = 133367136.

The previous prime is 194493979. The next prime is 194494009. The reversal of 194493985 is 589394491.

It can be written as a sum of positive squares in 2 ways, for example, as 63345681 + 131148304 = 7959^2 + 11452^2 .

It is not a de Polignac number, because 194493985 - 2⁵ = 194493953 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 396682 + ... + 397171.

It is an arithmetic number, because the mean of its divisors is an integer number (22624839).

Almost surely, 2^194493985 is an apocalyptic number.

It is an amenable number.

194493985 is a deficient number, since it is larger than the sum of its proper divisors (77004083).

194493985 is an equidigital number, since it uses as much as digits as its factorization.

194493985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793872 (or 793865 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 52.

The square root of 194493985 is about 13946.1100311162. The cubic root of 194493985 is about 579.3869711959.

The spelling of 194493985 in words is "one hundred ninety-four million, four hundred ninety-three thousand, nine hundred eighty-five".