18066387 has 4 divisors (see below), whose sum is σ = 24088520. Its totient is φ = 12044256.

The previous prime is 18066383. The next prime is 18066403. The reversal of 18066387 is 78366081.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 18066387 - 2² = 18066383 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18066383) 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, 3011062 + ... + 3011067.

It is an arithmetic number, because the mean of its divisors is an integer number (6022130).

Almost surely, 2^18066387 is an apocalyptic number.

18066387 is a deficient number, since it is larger than the sum of its proper divisors (6022133).

18066387 is an equidigital number, since it uses as much as digits as its factorization.

18066387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6022132.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 18066387 is about 4250.4572695182. The cubic root of 18066387 is about 262.3959351675.

The spelling of 18066387 in words is "eighteen million, sixty-six thousand, three hundred eighty-seven".