27853981 has 16 divisors (see below), whose sum is σ = 30384640. Its totient is φ = 25446960.

The previous prime is 27853967. The next prime is 27853993. The reversal of 27853981 is 18935872.

It is a cyclic number.

It is not a de Polignac number, because 27853981 - 2⁷ = 27853853 is a prime.

It is a super-2 number, since 2×27853981² = 1551688515096722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27853921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83986 + ... + 84316.

It is an arithmetic number, because the mean of its divisors is an integer number (1899040).

Almost surely, 2^27853981 is an apocalyptic number.

It is an amenable number.

27853981 is a deficient number, since it is larger than the sum of its proper divisors (2530659).

27853981 is a wasteful number, since it uses less digits than its factorization.

27853981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496.

The product of its digits is 120960, while the sum is 43.

The square root of 27853981 is about 5277.6870881097. The cubic root of 27853981 is about 303.1301201672.

The spelling of 27853981 in words is "twenty-seven million, eight hundred fifty-three thousand, nine hundred eighty-one".