203721940 has 12 divisors (see below), whose sum is σ = 427816116. Its totient is φ = 81488768.

The previous prime is 203721929. The next prime is 203721943. The reversal of 203721940 is 49127302.

It can be written as a sum of positive squares in 2 ways, for example, as 89189136 + 114532804 = 9444^2 + 10702^2 .

It is a junction number, because it is equal to n+sod(n) for n = 203721899 and 203721908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203721943) 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, 5093029 + ... + 5093068.

It is an arithmetic number, because the mean of its divisors is an integer number (35651343).

Almost surely, 2^203721940 is an apocalyptic number.

203721940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

203721940 is an abundant number, since it is smaller than the sum of its proper divisors (224094176).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

203721940 is a wasteful number, since it uses less digits than its factorization.

203721940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10186106 (or 10186104 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 203721940 is about 14273.1194908471. The cubic root of 203721940 is about 588.4089470093.

The spelling of 203721940 in words is "two hundred three million, seven hundred twenty-one thousand, nine hundred forty".