18226100 has 18 divisors (see below), whose sum is σ = 39550854. Its totient is φ = 7290400.

The previous prime is 18226093. The next prime is 18226121. The reversal of 18226100 is 162281.

It can be written as a sum of positive squares in 3 ways, for example, as 2274064 + 15952036 = 1508^2 + 3994^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 91031 + ... + 91230.

Almost surely, 2^18226100 is an apocalyptic number.

18226100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18226100 is an abundant number, since it is smaller than the sum of its proper divisors (21324754).

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

18226100 is a wasteful number, since it uses less digits than its factorization.

18226100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182275 (or 182268 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 18226100 is about 4269.2036728177. The cubic root of 18226100 is about 263.1668908504.

Adding to 18226100 its reverse (162281), we get a palindrome (18388381).

The spelling of 18226100 in words is "eighteen million, two hundred twenty-six thousand, one hundred".