18228986 has 8 divisors (see below), whose sum is σ = 27365364. Its totient is φ = 9107200.

The previous prime is 18228983. The next prime is 18228989. The reversal of 18228986 is 68982281.

It is an interprime number because it is at equal distance from previous prime (18228983) and next prime (18228989).

It can be written as a sum of positive squares in 2 ways, for example, as 17799961 + 429025 = 4219^2 + 655^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18228983) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 356 + ... + 6048.

Almost surely, 2^18228986 is an apocalyptic number.

18228986 is a deficient number, since it is larger than the sum of its proper divisors (9136378).

18228986 is a wasteful number, since it uses less digits than its factorization.

18228986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7296.

The product of its digits is 110592, while the sum is 44.

The square root of 18228986 is about 4269.5416615838. The cubic root of 18228986 is about 263.1807804476.

The spelling of 18228986 in words is "eighteen million, two hundred twenty-eight thousand, nine hundred eighty-six".