18128765 has 16 divisors (see below), whose sum is σ = 22450176. Its totient is φ = 14044800.

The previous prime is 18128729. The next prime is 18128791. The reversal of 18128765 is 56782181.

It is not a de Polignac number, because 18128765 - 2¹⁰ = 18127741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38924 + ... + 39386.

It is an arithmetic number, because the mean of its divisors is an integer number (1403136).

Almost surely, 2^18128765 is an apocalyptic number.

It is an amenable number.

18128765 is a deficient number, since it is larger than the sum of its proper divisors (4321411).

18128765 is a wasteful number, since it uses less digits than its factorization.

18128765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700.

The product of its digits is 26880, while the sum is 38.

The square root of 18128765 is about 4257.7887453466. The cubic root of 18128765 is about 262.6975806489.

The spelling of 18128765 in words is "eighteen million, one hundred twenty-eight thousand, seven hundred sixty-five".