18226881 has 24 divisors (see below), whose sum is σ = 27029184. Its totient is φ = 11832480.

The previous prime is 18226847. The next prime is 18226927. The reversal of 18226881 is 18862281.

It is not a de Polignac number, because 18226881 - 2¹⁴ = 18210497 is a prime.

It is a super-2 number, since 2×18226881² = 664438381976322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18226381) 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 23 ways as a sum of consecutive naturals, for example, 100611 + ... + 100791.

It is an arithmetic number, because the mean of its divisors is an integer number (1126216).

Almost surely, 2^18226881 is an apocalyptic number.

It is an amenable number.

18226881 is a deficient number, since it is larger than the sum of its proper divisors (8802303).

18226881 is a wasteful number, since it uses less digits than its factorization.

18226881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421 (or 418 counting only the distinct ones).

The product of its digits is 12288, while the sum is 36.

The square root of 18226881 is about 4269.2951408868. The cubic root of 18226881 is about 263.1706497530.

The spelling of 18226881 in words is "eighteen million, two hundred twenty-six thousand, eight hundred eighty-one".