18235985 has 8 divisors (see below), whose sum is σ = 23170536. Its totient is φ = 13730560.

The previous prime is 18235981. The next prime is 18236017. The reversal of 18235985 is 58953281.

It can be written as a sum of positive squares in 4 ways, for example, as 5626384 + 12609601 = 2372^2 + 3551^2 .

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

It is not a de Polignac number, because 18235985 - 2² = 18235981 is a prime.

It is a super-2 number, since 2×18235985² = 665102297840450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18235981) 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, 107186 + ... + 107355.

It is an arithmetic number, because the mean of its divisors is an integer number (2896317).

Almost surely, 2^18235985 is an apocalyptic number.

It is an amenable number.

18235985 is a deficient number, since it is larger than the sum of its proper divisors (4934551).

18235985 is a wasteful number, since it uses less digits than its factorization.

18235985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214563.

The product of its digits is 86400, while the sum is 41.

The square root of 18235985 is about 4270.3612259386. The cubic root of 18235985 is about 263.2144587989.

The spelling of 18235985 in words is "eighteen million, two hundred thirty-five thousand, nine hundred eighty-five".