18038413 has 2 divisors, whose sum is σ = 18038414. Its totient is φ = 18038412.

The previous prime is 18038407. The next prime is 18038441. The reversal of 18038413 is 31483081.

It is an a-pointer prime, because the next prime (18038441) can be obtained adding 18038413 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12264004 + 5774409 = 3502^2 + 2403^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18038413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18038443) 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 as a sum of consecutive naturals, namely, 9019206 + 9019207.

It is an arithmetic number, because the mean of its divisors is an integer number (9019207).

Almost surely, 2^18038413 is an apocalyptic number.

It is an amenable number.

18038413 is a deficient number, since it is larger than the sum of its proper divisors (1).

18038413 is an equidigital number, since it uses as much as digits as its factorization.

18038413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 18038413 is about 4247.1652899316. The cubic root of 18038413 is about 262.2604338872.

The spelling of 18038413 in words is "eighteen million, thirty-eight thousand, four hundred thirteen".