203999949 has 48 divisors (see below), whose sum is σ = 336960000. Its totient is φ = 118153728.

The previous prime is 203999927. The next prime is 203999951. The reversal of 203999949 is 949999302.

It is not a de Polignac number, because 203999949 - 2¹² = 203995853 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 203999895 and 203999904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203999959) 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 47 ways as a sum of consecutive naturals, for example, 101052 + ... + 103050.

It is an arithmetic number, because the mean of its divisors is an integer number (7020000).

Almost surely, 2^203999949 is an apocalyptic number.

203999949 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

203999949 is a deficient number, since it is larger than the sum of its proper divisors (132960051).

203999949 is a wasteful number, since it uses less digits than its factorization.

203999949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2074 (or 2071 counting only the distinct ones).

The product of its (nonzero) digits is 1417176, while the sum is 54.

The square root of 203999949 is about 14282.8550717285. The cubic root of 203999949 is about 588.6764826320.

The spelling of 203999949 in words is "two hundred three million, nine hundred ninety-nine thousand, nine hundred forty-nine".