203940193 has 4 divisors (see below), whose sum is σ = 204020740. Its totient is φ = 203859648.

The previous prime is 203940137. The next prime is 203940203. The reversal of 203940193 is 391049302.

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 191351889 + 12588304 = 13833^2 + 3548^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203940193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203940133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36348 + ... + 41581.

It is an arithmetic number, because the mean of its divisors is an integer number (51005185).

Almost surely, 2^203940193 is an apocalyptic number.

It is an amenable number.

203940193 is a deficient number, since it is larger than the sum of its proper divisors (80547).

203940193 is an equidigital number, since it uses as much as digits as its factorization.

203940193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80546.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 203940193 is about 14280.7630398379. The cubic root of 203940193 is about 588.6189983248.

Adding to 203940193 its reverse (391049302), we get a palindrome (594989495).

The spelling of 203940193 in words is "two hundred three million, nine hundred forty thousand, one hundred ninety-three".