18228658 has 32 divisors (see below), whose sum is σ = 33343488. Its totient is φ = 7296000.

The previous prime is 18228653. The next prime is 18228659. The reversal of 18228658 is 85682281.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18228658.

It is not an unprimeable number, because it can be changed into a prime (18228653) 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 15 ways as a sum of consecutive naturals, for example, 45258 + ... + 45658.

It is an arithmetic number, because the mean of its divisors is an integer number (1041984).

Almost surely, 2^18228658 is an apocalyptic number.

18228658 is a deficient number, since it is larger than the sum of its proper divisors (15114830).

18228658 is a wasteful number, since it uses less digits than its factorization.

18228658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618.

The product of its digits is 61440, while the sum is 40.

The square root of 18228658 is about 4269.5032497938. The cubic root of 18228658 is about 263.1792019393.

The spelling of 18228658 in words is "eighteen million, two hundred twenty-eight thousand, six hundred fifty-eight".