18703109 has 4 divisors (see below), whose sum is σ = 18818016. Its totient is φ = 18588204.

The previous prime is 18703099. The next prime is 18703127. The reversal of 18703109 is 90130781.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90130781 = 13 ⋅6933137.

It is a cyclic number.

It is not a de Polignac number, because 18703109 - 2¹² = 18699013 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 (18703159) 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 3 ways as a sum of consecutive naturals, for example, 57209 + ... + 57534.

It is an arithmetic number, because the mean of its divisors is an integer number (4704504).

Almost surely, 2^18703109 is an apocalyptic number.

It is an amenable number.

18703109 is a deficient number, since it is larger than the sum of its proper divisors (114907).

18703109 is a wasteful number, since it uses less digits than its factorization.

18703109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114906.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 18703109 is about 4324.7091231666. The cubic root of 18703109 is about 265.4429946547.

The spelling of 18703109 in words is "eighteen million, seven hundred three thousand, one hundred nine".