18720118 has 8 divisors (see below), whose sum is σ = 28169712. Its totient is φ = 9330216.

The previous prime is 18720083. The next prime is 18720173. The reversal of 18720118 is 81102781.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14130 + ... + 15397.

It is an arithmetic number, because the mean of its divisors is an integer number (3521214).

Almost surely, 2^18720118 is an apocalyptic number.

18720118 is a deficient number, since it is larger than the sum of its proper divisors (9449594).

18720118 is a wasteful number, since it uses less digits than its factorization.

18720118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29846.

The product of its (nonzero) digits is 896, while the sum is 28.

The square root of 18720118 is about 4326.6751669151. The cubic root of 18720118 is about 265.5234367518.

Adding to 18720118 its reverse (81102781), we get a palindrome (99822899).

The spelling of 18720118 in words is "eighteen million, seven hundred twenty thousand, one hundred eighteen".