27394781 has 2 divisors, whose sum is σ = 27394782. Its totient is φ = 27394780.

The previous prime is 27394777. The next prime is 27394811. The reversal of 27394781 is 18749372.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27394756 + 25 = 5234^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 27394781 - 2² = 27394777 is a prime.

It is a super-2 number, since 2×27394781² = 1500948052075922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27354781) 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 as a sum of consecutive naturals, namely, 13697390 + 13697391.

It is an arithmetic number, because the mean of its divisors is an integer number (13697391).

Almost surely, 2^27394781 is an apocalyptic number.

It is an amenable number.

27394781 is a deficient number, since it is larger than the sum of its proper divisors (1).

27394781 is an equidigital number, since it uses as much as digits as its factorization.

27394781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 41.

The square root of 27394781 is about 5234.0023882303. The cubic root of 27394781 is about 301.4550828875.

The spelling of 27394781 in words is "twenty-seven million, three hundred ninety-four thousand, seven hundred eighty-one".