18835985 has 16 divisors (see below), whose sum is σ = 25931136. Its totient is φ = 12866688.

The previous prime is 18835979. The next prime is 18835987. The reversal of 18835985 is 58953881.

It is a cyclic number.

It is not a de Polignac number, because 18835985 - 2¹⁴ = 18819601 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18835987) 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, 9869 + ... + 11621.

It is an arithmetic number, because the mean of its divisors is an integer number (1620696).

Almost surely, 2^18835985 is an apocalyptic number.

It is an amenable number.

18835985 is a deficient number, since it is larger than the sum of its proper divisors (7095151).

18835985 is a wasteful number, since it uses less digits than its factorization.

18835985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2072.

The product of its digits is 345600, while the sum is 47.

The square root of 18835985 is about 4340.0443546121. The cubic root of 18835985 is about 266.0701239734.

The spelling of 18835985 in words is "eighteen million, eight hundred thirty-five thousand, nine hundred eighty-five".