203966 has 16 divisors (see below), whose sum is σ = 370656. Its totient is φ = 82176.

The previous prime is 203953. The next prime is 203969. The reversal of 203966 is 669302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191 + ... + 666.

It is an arithmetic number, because the mean of its divisors is an integer number (23166).

2²⁰³⁹⁶⁶ is an apocalyptic number.

203966 is a deficient number, since it is larger than the sum of its proper divisors (166690).

203966 is a wasteful number, since it uses less digits than its factorization.

203966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 883.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 203966 is about 451.6259514244. The cubic root of 203966 is about 58.8643825620.

It can be divided in two parts, 20396 and 6, that added together give a palindrome (20402).

The spelling of 203966 in words is "two hundred three thousand, nine hundred sixty-six".