203855 has 4 divisors (see below), whose sum is σ = 244632. Its totient is φ = 163080.

The previous prime is 203843. The next prime is 203857. The reversal of 203855 is 558302.

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

It is not a de Polignac number, because 203855 - 2¹⁴ = 187471 is a prime.

It is a super-2 number, since 2×203855² = 83113722050, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 203855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203857) 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, 20381 + ... + 20390.

It is an arithmetic number, because the mean of its divisors is an integer number (61158).

2²⁰³⁸⁵⁵ is an apocalyptic number.

203855 is a deficient number, since it is larger than the sum of its proper divisors (40777).

203855 is an equidigital number, since it uses as much as digits as its factorization.

203855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40776.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 203855 is about 451.5030453939. The cubic root of 203855 is about 58.8537024615.

The spelling of 203855 in words is "two hundred three thousand, eight hundred fifty-five".