18001027 has 4 divisors (see below), whose sum is σ = 19637496. Its totient is φ = 16364560.

The previous prime is 18000989. The next prime is 18001031. The reversal of 18001027 is 72010081.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18001027 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18000995 and 18001013.

It is not an unprimeable number, because it can be changed into a prime (18001057) 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, 818218 + ... + 818239.

It is an arithmetic number, because the mean of its divisors is an integer number (4909374).

Almost surely, 2^18001027 is an apocalyptic number.

18001027 is a deficient number, since it is larger than the sum of its proper divisors (1636469).

18001027 is a wasteful number, since it uses less digits than its factorization.

18001027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1636468.

The product of its (nonzero) digits is 112, while the sum is 19.

The square root of 18001027 is about 4242.7617185036. The cubic root of 18001027 is about 262.0791235880.

The spelling of 18001027 in words is "eighteen million, one thousand, twenty-seven".