194784993 has 40 divisors (see below), whose sum is σ = 316324008. Its totient is φ = 118734336.

The previous prime is 194784977. The next prime is 194785001. The reversal of 194784993 is 399487491.

It can be written as a sum of positive squares in 4 ways, for example, as 34433424 + 160351569 = 5868^2 + 12663^2 .

It is not a de Polignac number, because 194784993 - 2⁴ = 194784977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (194784913) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 118171 + ... + 119807.

Almost surely, 2^194784993 is an apocalyptic number.

194784993 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

194784993 is a deficient number, since it is larger than the sum of its proper divisors (121539015).

194784993 is a wasteful number, since it uses less digits than its factorization.

194784993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1775 (or 1766 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 54.

The square root of 194784993 is about 13956.5394349746. The cubic root of 194784993 is about 579.6757928480.

The spelling of 194784993 in words is "one hundred ninety-four million, seven hundred eighty-four thousand, nine hundred ninety-three".