27439961 has 2 divisors, whose sum is σ = 27439962. Its totient is φ = 27439960.

The previous prime is 27439859. The next prime is 27439999. The reversal of 27439961 is 16993472.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26584336 + 855625 = 5156^2 + 925^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27439961 is a prime.

It is not a weakly prime, because it can be changed into another prime (27439561) 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 as a sum of consecutive naturals, namely, 13719980 + 13719981.

It is an arithmetic number, because the mean of its divisors is an integer number (13719981).

Almost surely, 2^27439961 is an apocalyptic number.

It is an amenable number.

27439961 is a deficient number, since it is larger than the sum of its proper divisors (1).

27439961 is an equidigital number, since it uses as much as digits as its factorization.

27439961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 41.

The square root of 27439961 is about 5238.3166189149. The cubic root of 27439961 is about 301.6207137082.

The spelling of 27439961 in words is "twenty-seven million, four hundred thirty-nine thousand, nine hundred sixty-one".