18027681 has 32 divisors (see below), whose sum is σ = 28366848. Its totient is φ = 9972480.

The previous prime is 18027679. The next prime is 18027697. The reversal of 18027681 is 18672081.

It is a happy number.

It is not a de Polignac number, because 18027681 - 2¹ = 18027679 is a prime.

It is a super-2 number, since 2×18027681² = 649994564475522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18027631) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 159481 + ... + 159593.

It is an arithmetic number, because the mean of its divisors is an integer number (886464).

Almost surely, 2^18027681 is an apocalyptic number.

It is an amenable number.

18027681 is a deficient number, since it is larger than the sum of its proper divisors (10339167).

18027681 is a wasteful number, since it uses less digits than its factorization.

18027681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301.

The product of its (nonzero) digits is 5376, while the sum is 33.

The square root of 18027681 is about 4245.9016710235. The cubic root of 18027681 is about 262.2084127302.

The spelling of 18027681 in words is "eighteen million, twenty-seven thousand, six hundred eighty-one".