18872135 has 4 divisors (see below), whose sum is σ = 22646568. Its totient is φ = 15097704.

The previous prime is 18872123. The next prime is 18872143. The reversal of 18872135 is 53127881.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18872135 - 2⁶ = 18872071 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18872095 and 18872104.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1887209 + ... + 1887218.

It is an arithmetic number, because the mean of its divisors is an integer number (5661642).

Almost surely, 2^18872135 is an apocalyptic number.

18872135 is a deficient number, since it is larger than the sum of its proper divisors (3774433).

18872135 is an equidigital number, since it uses as much as digits as its factorization.

18872135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3774432.

The product of its digits is 13440, while the sum is 35.

The square root of 18872135 is about 4344.2070622842. The cubic root of 18872135 is about 266.2402290198.

The spelling of 18872135 in words is "eighteen million, eight hundred seventy-two thousand, one hundred thirty-five".