18685355 has 16 divisors (see below), whose sum is σ = 24314304. Its totient is φ = 13703040.

The previous prime is 18685351. The next prime is 18685357. The reversal of 18685355 is 55358681.

It is not a de Polignac number, because 18685355 - 2² = 18685351 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18685351) 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, 9290 + ... + 11120.

It is an arithmetic number, because the mean of its divisors is an integer number (1519644).

Almost surely, 2^18685355 is an apocalyptic number.

18685355 is a deficient number, since it is larger than the sum of its proper divisors (5628949).

18685355 is a wasteful number, since it uses less digits than its factorization.

18685355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2006.

The product of its digits is 144000, while the sum is 41.

The square root of 18685355 is about 4322.6560122221. The cubic root of 18685355 is about 265.3589771278.

The spelling of 18685355 in words is "eighteen million, six hundred eighty-five thousand, three hundred fifty-five".