18228087 has 48 divisors (see below), whose sum is σ = 29560960. Its totient is φ = 10777536.

The previous prime is 18228083. The next prime is 18228157. The reversal of 18228087 is 78082281.

It is not a de Polignac number, because 18228087 - 2² = 18228083 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18228083) 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 47 ways as a sum of consecutive naturals, for example, 272028 + ... + 272094.

Almost surely, 2^18228087 is an apocalyptic number.

18228087 is a deficient number, since it is larger than the sum of its proper divisors (11332873).

18228087 is a wasteful number, since it uses less digits than its factorization.

18228087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172 (or 169 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 18228087 is about 4269.4363796642. The cubic root of 18228087 is about 263.1764539423.

The spelling of 18228087 in words is "eighteen million, two hundred twenty-eight thousand, eighty-seven".