18903413 has 2 divisors, whose sum is σ = 18903414. Its totient is φ = 18903412.

The previous prime is 18903407. The next prime is 18903427. The reversal of 18903413 is 31430981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18679684 + 223729 = 4322^2 + 473^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18903413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18903433) 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 as a sum of consecutive naturals, namely, 9451706 + 9451707.

It is an arithmetic number, because the mean of its divisors is an integer number (9451707).

Almost surely, 2^18903413 is an apocalyptic number.

It is an amenable number.

18903413 is a deficient number, since it is larger than the sum of its proper divisors (1).

18903413 is an equidigital number, since it uses as much as digits as its factorization.

18903413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 18903413 is about 4347.8055384297. The cubic root of 18903413 is about 266.3872335067.

The spelling of 18903413 in words is "eighteen million, nine hundred three thousand, four hundred thirteen".