194999393 has 12 divisors (see below), whose sum is σ = 208470420. Its totient is φ = 182175840.

The previous prime is 194999351. The next prime is 194999407. The reversal of 194999393 is 393999491.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 81938704 + 113060689 = 9052^2 + 10633^2 .

It is not a de Polignac number, because 194999393 - 2²² = 190805089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194999323) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24371 + ... + 31367.

It is an arithmetic number, because the mean of its divisors is an integer number (17372535).

Almost surely, 2^194999393 is an apocalyptic number.

It is an amenable number.

194999393 is a deficient number, since it is larger than the sum of its proper divisors (13471027).

194999393 is an equidigital number, since it uses as much as digits as its factorization.

194999393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7088 (or 7057 counting only the distinct ones).

The product of its digits is 2125764, while the sum is 56.

The square root of 194999393 is about 13964.2183096656. The cubic root of 194999393 is about 579.8883980675. Note that the first 3 decimals are identical.

The spelling of 194999393 in words is "one hundred ninety-four million, nine hundred ninety-nine thousand, three hundred ninety-three".