18406985 has 8 divisors (see below), whose sum is σ = 22133760. Its totient is φ = 14695344.

The previous prime is 18406981. The next prime is 18406987. The reversal of 18406985 is 58960481.

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

It is a cyclic number.

It is not a de Polignac number, because 18406985 - 2² = 18406981 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18406981) 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, 905 + ... + 6134.

It is an arithmetic number, because the mean of its divisors is an integer number (2766720).

Almost surely, 2^18406985 is an apocalyptic number.

It is an amenable number.

18406985 is a deficient number, since it is larger than the sum of its proper divisors (3726775).

18406985 is an equidigital number, since it uses as much as digits as its factorization.

18406985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7567.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 18406985 is about 4290.3362339099. The cubic root of 18406985 is about 264.0346268095.

It can be divided in two parts, 18406 and 985, that added together give a palindrome (19391).

The spelling of 18406985 in words is "eighteen million, four hundred six thousand, nine hundred eighty-five".