27681239 has 2 divisors, whose sum is σ = 27681240. Its totient is φ = 27681238.

The previous prime is 27681223. The next prime is 27681263. The reversal of 27681239 is 93218672.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27681239 - 2⁴ = 27681223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27681289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13840619 + 13840620.

It is an arithmetic number, because the mean of its divisors is an integer number (13840620).

Almost surely, 2^27681239 is an apocalyptic number.

27681239 is a deficient number, since it is larger than the sum of its proper divisors (1).

27681239 is an equidigital number, since it uses as much as digits as its factorization.

27681239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 38.

The square root of 27681239 is about 5261.2963231508. The cubic root of 27681239 is about 302.5021797079.

The spelling of 27681239 in words is "twenty-seven million, six hundred eighty-one thousand, two hundred thirty-nine".