193923893 has 4 divisors (see below), whose sum is σ = 194066508. Its totient is φ = 193781280.

The previous prime is 193923869. The next prime is 193923949. The reversal of 193923893 is 398329391.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 185150449 + 8773444 = 13607^2 + 2962^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-193923893 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (193923853) 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, 69248 + ... + 71993.

It is an arithmetic number, because the mean of its divisors is an integer number (48516627).

Almost surely, 2^193923893 is an apocalyptic number.

It is an amenable number.

193923893 is a deficient number, since it is larger than the sum of its proper divisors (142615).

193923893 is a wasteful number, since it uses less digits than its factorization.

193923893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142614.

The product of its digits is 314928, while the sum is 47.

The square root of 193923893 is about 13925.6559271009. The cubic root of 193923893 is about 578.8203262039.

The spelling of 193923893 in words is "one hundred ninety-three million, nine hundred twenty-three thousand, eight hundred ninety-three".