193991768 has 16 divisors (see below), whose sum is σ = 368340000. Its totient is φ = 95767776.

The previous prime is 193991761. The next prime is 193991779. The reversal of 193991768 is 867199391.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (193991761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152843 + ... + 154106.

It is an arithmetic number, because the mean of its divisors is an integer number (23021250).

Almost surely, 2^193991768 is an apocalyptic number.

It is an amenable number.

193991768 is a deficient number, since it is larger than the sum of its proper divisors (174348232).

193991768 is a wasteful number, since it uses less digits than its factorization.

193991768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307034 (or 307030 counting only the distinct ones).

The product of its digits is 734832, while the sum is 53.

The square root of 193991768 is about 13928.0927624711. The cubic root of 193991768 is about 578.8878489939.

The spelling of 193991768 in words is "one hundred ninety-three million, nine hundred ninety-one thousand, seven hundred sixty-eight".