18903713 has 4 divisors (see below), whose sum is σ = 18971268. Its totient is φ = 18836160.

The previous prime is 18903691. The next prime is 18903719. The reversal of 18903713 is 31730981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31730981 = 137 ⋅231613.

It can be written as a sum of positive squares in 2 ways, for example, as 7118224 + 11785489 = 2668^2 + 3433^2 .

It is a cyclic number.

It is not a de Polignac number, because 18903713 - 2⁶ = 18903649 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18903713.

It is not an unprimeable number, because it can be changed into a prime (18903719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33356 + ... + 33917.

It is an arithmetic number, because the mean of its divisors is an integer number (4742817).

Almost surely, 2^18903713 is an apocalyptic number.

It is an amenable number.

18903713 is a deficient number, since it is larger than the sum of its proper divisors (67555).

18903713 is an equidigital number, since it uses as much as digits as its factorization.

18903713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67554.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 18903713 is about 4347.8400384559. The cubic root of 18903713 is about 266.3886427010.

The spelling of 18903713 in words is "eighteen million, nine hundred three thousand, seven hundred thirteen".