203103993 has 12 divisors (see below), whose sum is σ = 272203728. Its totient is φ = 134706960.

The previous prime is 203103983. The next prime is 203104043. The reversal of 203103993 is 399301302.

It is not a de Polignac number, because 203103993 - 2¹⁰ = 203102969 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 203103993.

It is not an unprimeable number, because it can be changed into a prime (203103973) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 156678 + ... + 157968.

It is an arithmetic number, because the mean of its divisors is an integer number (22683644).

Almost surely, 2^203103993 is an apocalyptic number.

It is an amenable number.

203103993 is a deficient number, since it is larger than the sum of its proper divisors (69099735).

203103993 is an equidigital number, since it uses as much as digits as its factorization.

203103993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1752 (or 1523 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 30.

The square root of 203103993 is about 14251.4558203715. The cubic root of 203103993 is about 587.8134068263.

It can be divided in two parts, 203 and 103993, that added together give a triangular number (104196 = T₄₅₆).

The spelling of 203103993 in words is "two hundred three million, one hundred three thousand, nine hundred ninety-three".