18226556 has 12 divisors (see below), whose sum is σ = 32419800. Its totient is φ = 8963760.

The previous prime is 18226517. The next prime is 18226573. The reversal of 18226556 is 65562281.

It is a super-2 number, since 2×18226556² = 664414687242272, 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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37106 + ... + 37593.

It is an arithmetic number, because the mean of its divisors is an integer number (2701650).

Almost surely, 2^18226556 is an apocalyptic number.

It is an amenable number.

18226556 is a deficient number, since it is larger than the sum of its proper divisors (14193244).

18226556 is a wasteful number, since it uses less digits than its factorization.

18226556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74764 (or 74762 counting only the distinct ones).

The product of its digits is 28800, while the sum is 35.

The square root of 18226556 is about 4269.2570782280. The cubic root of 18226556 is about 263.1690855620.

The spelling of 18226556 in words is "eighteen million, two hundred twenty-six thousand, five hundred fifty-six".