18226716 has 12 divisors (see below), whose sum is σ = 42529032. Its totient is φ = 6075568.

The previous prime is 18226699. The next prime is 18226759. The reversal of 18226716 is 61762281.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×18226716² = 664426352289312, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 759435 + ... + 759458.

It is an arithmetic number, because the mean of its divisors is an integer number (3544086).

Almost surely, 2^18226716 is an apocalyptic number.

It is an amenable number.

18226716 is an abundant number, since it is smaller than the sum of its proper divisors (24302316).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18226716 is a wasteful number, since it uses less digits than its factorization.

18226716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1518900 (or 1518898 counting only the distinct ones).

The product of its digits is 8064, while the sum is 33.

The square root of 18226716 is about 4269.2758168102. The cubic root of 18226716 is about 263.1698556276.

Adding to 18226716 its reverse (61762281), we get a palindrome (79988997).

The spelling of 18226716 in words is "eighteen million, two hundred twenty-six thousand, seven hundred sixteen".