203963 has 4 divisors (see below), whose sum is σ = 207480. Its totient is φ = 200448.

The previous prime is 203953. The next prime is 203969. The reversal of 203963 is 369302.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 369302 = 2 ⋅184651.

It is a cyclic number.

It is not a de Polignac number, because 203963 - 2⁴ = 203947 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 1670 + ... + 1787.

It is an arithmetic number, because the mean of its divisors is an integer number (51870).

2²⁰³⁹⁶³ is an apocalyptic number.

203963 is a deficient number, since it is larger than the sum of its proper divisors (3517).

203963 is an equidigital number, since it uses as much as digits as its factorization.

203963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3516.

The product of its (nonzero) digits is 972, while the sum is 23.

The square root of 203963 is about 451.6226300796. The cubic root of 203963 is about 58.8640939615.

The spelling of 203963 in words is "two hundred three thousand, nine hundred sixty-three".