18508705 has 16 divisors (see below), whose sum is σ = 23468544. Its totient is φ = 13991040.

The previous prime is 18508703. The next prime is 18508727. The reversal of 18508705 is 50780581.

It is not a de Polignac number, because 18508705 - 2¹ = 18508703 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18508703) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5277 + ... + 8053.

It is an arithmetic number, because the mean of its divisors is an integer number (1466784).

Almost surely, 2^18508705 is an apocalyptic number.

It is an amenable number.

18508705 is a deficient number, since it is larger than the sum of its proper divisors (4959839).

18508705 is a wasteful number, since it uses less digits than its factorization.

18508705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2856.

The product of its (nonzero) digits is 11200, while the sum is 34.

The square root of 18508705 is about 4302.1744502054. The cubic root of 18508705 is about 264.5200997682.

The spelling of 18508705 in words is "eighteen million, five hundred eight thousand, seven hundred five".