18481685 has 8 divisors (see below), whose sum is σ = 22777656. Its totient is φ = 14385600.

The previous prime is 18481667. The next prime is 18481709. The reversal of 18481685 is 58618481.

It can be written as a sum of positive squares in 4 ways, for example, as 10608049 + 7873636 = 3257^2 + 2806^2 .

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

It is not a de Polignac number, because 18481685 - 2⁶ = 18481621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49766 + ... + 50135.

It is an arithmetic number, because the mean of its divisors is an integer number (2847207).

Almost surely, 2^18481685 is an apocalyptic number.

It is an amenable number.

18481685 is a deficient number, since it is larger than the sum of its proper divisors (4295971).

18481685 is an equidigital number, since it uses as much as digits as its factorization.

18481685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99943.

The product of its digits is 61440, while the sum is 41.

The square root of 18481685 is about 4299.0330308105. The cubic root of 18481685 is about 264.3913168713.

The spelling of 18481685 in words is "eighteen million, four hundred eighty-one thousand, six hundred eighty-five".