18211713 has 16 divisors (see below), whose sum is σ = 26522496. Its totient is φ = 11047680.

The previous prime is 18211679. The next prime is 18211717. The reversal of 18211713 is 31711281.

It is a happy number.

It is not a de Polignac number, because 18211713 - 2⁹ = 18211201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18211717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 520 + ... + 6057.

It is an arithmetic number, because the mean of its divisors is an integer number (1657656).

Almost surely, 2^18211713 is an apocalyptic number.

18211713 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18211713 is a deficient number, since it is larger than the sum of its proper divisors (8310783).

18211713 is a wasteful number, since it uses less digits than its factorization.

18211713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6664.

The product of its digits is 336, while the sum is 24.

The square root of 18211713 is about 4267.5183655141. The cubic root of 18211713 is about 263.0976279303.

Adding to 18211713 its reverse (31711281), we get a palindrome (49922994).

The spelling of 18211713 in words is "eighteen million, two hundred eleven thousand, seven hundred thirteen".