18228726 has 40 divisors (see below), whose sum is σ = 43255080. Its totient is φ = 5717952.

The previous prime is 18228703. The next prime is 18228797. The reversal of 18228726 is 62782281.

It is a happy number.

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 19 ways as a sum of consecutive naturals, for example, 556 + ... + 6063.

It is an arithmetic number, because the mean of its divisors is an integer number (1081377).

Almost surely, 2^18228726 is an apocalyptic number.

18228726 is an abundant number, since it is smaller than the sum of its proper divisors (25026354).

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

18228726 is a wasteful number, since it uses less digits than its factorization.

18228726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6650 (or 6641 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 18228726 is about 4269.5112132421. The cubic root of 18228726 is about 263.1795291926.

The spelling of 18228726 in words is "eighteen million, two hundred twenty-eight thousand, seven hundred twenty-six".