18118709 has 16 divisors (see below), whose sum is σ = 21196800. Its totient is φ = 15168384.

The previous prime is 18118699. The next prime is 18118717. The reversal of 18118709 is 90781181.

It is not a de Polignac number, because 18118709 - 2²⁴ = 1341493 is a prime.

It is a super-3 number, since 3×18118709³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18118109) 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 15 ways as a sum of consecutive naturals, for example, 79007 + ... + 79235.

It is an arithmetic number, because the mean of its divisors is an integer number (1324800).

Almost surely, 2^18118709 is an apocalyptic number.

It is an amenable number.

18118709 is a deficient number, since it is larger than the sum of its proper divisors (3078091).

18118709 is a wasteful number, since it uses less digits than its factorization.

18118709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452.

The product of its (nonzero) digits is 4032, while the sum is 35.

The square root of 18118709 is about 4256.6076868793. The cubic root of 18118709 is about 262.6489990078.

The spelling of 18118709 in words is "eighteen million, one hundred eighteen thousand, seven hundred nine".