18709718 has 16 divisors (see below), whose sum is σ = 30827520. Its totient is φ = 8476776.

The previous prime is 18709711. The next prime is 18709721. The reversal of 18709718 is 81790781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18709711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9830 + ... + 11577.

It is an arithmetic number, because the mean of its divisors is an integer number (1926720).

Almost surely, 2^18709718 is an apocalyptic number.

18709718 is a deficient number, since it is larger than the sum of its proper divisors (12117802).

18709718 is a wasteful number, since it uses less digits than its factorization.

18709718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21451.

The product of its (nonzero) digits is 28224, while the sum is 41.

The square root of 18709718 is about 4325.4731533094. The cubic root of 18709718 is about 265.4742569465.

The spelling of 18709718 in words is "eighteen million, seven hundred nine thousand, seven hundred eighteen".