27939971 has 2 divisors, whose sum is σ = 27939972. Its totient is φ = 27939970.

The previous prime is 27939943. The next prime is 27939979. The reversal of 27939971 is 17993972.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27939971 - 2⁶ = 27939907 is a prime.

It is a super-3 number, since 3×27939971³ (a number of 23 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27939979) 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, 13969985 + 13969986.

It is an arithmetic number, because the mean of its divisors is an integer number (13969986).

Almost surely, 2^27939971 is an apocalyptic number.

27939971 is a deficient number, since it is larger than the sum of its proper divisors (1).

27939971 is an equidigital number, since it uses as much as digits as its factorization.

27939971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 214326, while the sum is 47.

The square root of 27939971 is about 5285.8273713772. The cubic root of 27939971 is about 303.4417378779.

The spelling of 27939971 in words is "twenty-seven million, nine hundred thirty-nine thousand, nine hundred seventy-one".