27438181 has 2 divisors, whose sum is σ = 27438182. Its totient is φ = 27438180.

The previous prime is 27438161. The next prime is 27438197. The reversal of 27438181 is 18183472.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24910081 + 2528100 = 4991^2 + 1590^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27438181 is a prime.

It is a super-2 number, since 2×27438181² = 1505707553177522, which contains 22 as substring.

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

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27438101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13719090 + 13719091.

It is an arithmetic number, because the mean of its divisors is an integer number (13719091).

Almost surely, 2^27438181 is an apocalyptic number.

It is an amenable number.

27438181 is a deficient number, since it is larger than the sum of its proper divisors (1).

27438181 is an equidigital number, since it uses as much as digits as its factorization.

27438181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10752, while the sum is 34.

The square root of 27438181 is about 5238.1467142492. The cubic root of 27438181 is about 301.6141916329.

The spelling of 27438181 in words is "twenty-seven million, four hundred thirty-eight thousand, one hundred eighty-one".