18203941 has 6 divisors (see below), whose sum is σ = 21176070. Its totient is φ = 15603336.

The previous prime is 18203929. The next prime is 18203947. The reversal of 18203941 is 14930281.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17056900 + 1147041 = 4130^2 + 1071^2 .

It is not a de Polignac number, because 18203941 - 2¹⁷ = 18072869 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 (18203947) 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 5 ways as a sum of consecutive naturals, for example, 185706 + ... + 185803.

It is an arithmetic number, because the mean of its divisors is an integer number (3529345).

Almost surely, 2^18203941 is an apocalyptic number.

It is an amenable number.

18203941 is a deficient number, since it is larger than the sum of its proper divisors (2972129).

18203941 is an equidigital number, since it uses as much as digits as its factorization.

18203941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371523 (or 371516 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 18203941 is about 4266.6076688629. The cubic root of 18203941 is about 263.0601962381.

The spelling of 18203941 in words is "eighteen million, two hundred three thousand, nine hundred forty-one".