18988709 has 8 divisors (see below), whose sum is σ = 19737600. Its totient is φ = 18248400.

The previous prime is 18988693. The next prime is 18988721. The reversal of 18988709 is 90788981.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18988709 - 2⁴ = 18988693 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18988729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2564 + ... + 6674.

It is an arithmetic number, because the mean of its divisors is an integer number (2467200).

Almost surely, 2^18988709 is an apocalyptic number.

It is an amenable number.

18988709 is a deficient number, since it is larger than the sum of its proper divisors (748891).

18988709 is a wasteful number, since it uses less digits than its factorization.

18988709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4291.

The product of its (nonzero) digits is 290304, while the sum is 50.

The square root of 18988709 is about 4357.6035845405. The cubic root of 18988709 is about 266.7872966386.

The spelling of 18988709 in words is "eighteen million, nine hundred eighty-eight thousand, seven hundred nine".