18228458 has 8 divisors (see below), whose sum is σ = 27408900. Its totient is φ = 9092160.

The previous prime is 18228439. The next prime is 18228461. The reversal of 18228458 is 85482281.

It can be written as a sum of positive squares in 2 ways, for example, as 15155449 + 3073009 = 3893^2 + 1753^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 9983 + ... + 11666.

Almost surely, 2^18228458 is an apocalyptic number.

18228458 is a deficient number, since it is larger than the sum of its proper divisors (9180442).

18228458 is a wasteful number, since it uses less digits than its factorization.

18228458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22072.

The product of its digits is 40960, while the sum is 38.

The square root of 18228458 is about 4269.4798278010. The cubic root of 18228458 is about 263.1782394250.

The spelling of 18228458 in words is "eighteen million, two hundred twenty-eight thousand, four hundred fifty-eight".