27018981 has 32 divisors (see below), whose sum is σ = 45187200. Its totient is φ = 15805440.

The previous prime is 27018941. The next prime is 27019009. The reversal of 27018981 is 18981072.

It is not a de Polignac number, because 27018981 - 2⁷ = 27018853 is a prime.

It is a super-2 number, since 2×27018981² = 1460050668556722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27018911) 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 31 ways as a sum of consecutive naturals, for example, 7045 + ... + 10181.

It is an arithmetic number, because the mean of its divisors is an integer number (1412100).

Almost surely, 2^27018981 is an apocalyptic number.

It is an amenable number.

27018981 is a deficient number, since it is larger than the sum of its proper divisors (18168219).

27018981 is a wasteful number, since it uses less digits than its factorization.

27018981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3186 (or 3180 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 27018981 is about 5197.9785493978. The cubic root of 27018981 is about 300.0702835328.

The spelling of 27018981 in words is "twenty-seven million, eighteen thousand, nine hundred eighty-one".