18668087 has 4 divisors (see below), whose sum is σ = 18679200. Its totient is φ = 18656976.

The previous prime is 18668077. The next prime is 18668099. The reversal of 18668087 is 78086681.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 78086681 = 79 ⋅988439.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18668087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18668047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2462 + ... + 6587.

It is an arithmetic number, because the mean of its divisors is an integer number (4669800).

Almost surely, 2^18668087 is an apocalyptic number.

18668087 is a deficient number, since it is larger than the sum of its proper divisors (11113).

18668087 is an equidigital number, since it uses as much as digits as its factorization.

18668087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11112.

The product of its (nonzero) digits is 129024, while the sum is 44.

The square root of 18668087 is about 4320.6581674555. The cubic root of 18668087 is about 265.2772084362.

The spelling of 18668087 in words is "eighteen million, six hundred sixty-eight thousand, eighty-seven".