18185713 has 12 divisors (see below), whose sum is σ = 22782900. Its totient is φ = 14388192.

The previous prime is 18185711. The next prime is 18185719. The reversal of 18185713 is 31758181.

It can be written as a sum of positive squares in 2 ways, for example, as 3038049 + 15147664 = 1743^2 + 3892^2 .

It is not a de Polignac number, because 18185713 - 2¹ = 18185711 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18185711) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13638 + ... + 14911.

It is an arithmetic number, because the mean of its divisors is an integer number (1898575).

Almost surely, 2^18185713 is an apocalyptic number.

18185713 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18185713 is a deficient number, since it is larger than the sum of its proper divisors (4597187).

18185713 is a wasteful number, since it uses less digits than its factorization.

18185713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28576 (or 28569 counting only the distinct ones).

The product of its digits is 6720, while the sum is 34.

The square root of 18185713 is about 4264.4710105709. The cubic root of 18185713 is about 262.9723642934.

The spelling of 18185713 in words is "eighteen million, one hundred eighty-five thousand, seven hundred thirteen".