18885709 has 4 divisors (see below), whose sum is σ = 18908604. Its totient is φ = 18862816.

The previous prime is 18885703. The next prime is 18885731. The reversal of 18885709 is 90758881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90758881 = 1699 ⋅53419.

It can be written as a sum of positive squares in 2 ways, for example, as 10017225 + 8868484 = 3165^2 + 2978^2 .

It is a cyclic number.

It is not a de Polignac number, because 18885709 - 2³ = 18885701 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 (18885701) 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, 10162 + ... + 11875.

It is an arithmetic number, because the mean of its divisors is an integer number (4727151).

Almost surely, 2^18885709 is an apocalyptic number.

It is an amenable number.

18885709 is a deficient number, since it is larger than the sum of its proper divisors (22895).

18885709 is an equidigital number, since it uses as much as digits as its factorization.

18885709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22894.

The product of its (nonzero) digits is 161280, while the sum is 46.

The square root of 18885709 is about 4345.7690918870. The cubic root of 18885709 is about 266.3040458368.

The spelling of 18885709 in words is "eighteen million, eight hundred eighty-five thousand, seven hundred nine".