18003749 has 2 divisors, whose sum is σ = 18003750. Its totient is φ = 18003748.

The previous prime is 18003743. The next prime is 18003757. The reversal of 18003749 is 94730081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17581249 + 422500 = 4193^2 + 650^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18003749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18003743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9001874 + 9001875.

It is an arithmetic number, because the mean of its divisors is an integer number (9001875).

Almost surely, 2^18003749 is an apocalyptic number.

It is an amenable number.

18003749 is a deficient number, since it is larger than the sum of its proper divisors (1).

18003749 is an equidigital number, since it uses as much as digits as its factorization.

18003749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 18003749 is about 4243.0824880033. The cubic root of 18003749 is about 262.0923328976.

The spelling of 18003749 in words is "eighteen million, three thousand, seven hundred forty-nine".