18345985 has 8 divisors (see below), whose sum is σ = 25160256. Its totient is φ = 12580080.

The previous prime is 18345967. The next prime is 18345989. The reversal of 18345985 is 58954381.

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

It is not a de Polignac number, because 18345985 - 2⁵ = 18345953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18345989) 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, 262051 + ... + 262120.

It is an arithmetic number, because the mean of its divisors is an integer number (3145032).

Almost surely, 2^18345985 is an apocalyptic number.

It is an amenable number.

18345985 is a deficient number, since it is larger than the sum of its proper divisors (6814271).

18345985 is an equidigital number, since it uses as much as digits as its factorization.

18345985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524183.

The product of its digits is 172800, while the sum is 43.

The square root of 18345985 is about 4283.2213344631. The cubic root of 18345985 is about 263.7426373513.

The spelling of 18345985 in words is "eighteen million, three hundred forty-five thousand, nine hundred eighty-five".