27639971 has 2 divisors, whose sum is σ = 27639972. Its totient is φ = 27639970.

The previous prime is 27639959. The next prime is 27640001. The reversal of 27639971 is 17993672.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27639971 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27632971) 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, 13819985 + 13819986.

It is an arithmetic number, because the mean of its divisors is an integer number (13819986).

Almost surely, 2^27639971 is an apocalyptic number.

27639971 is a deficient number, since it is larger than the sum of its proper divisors (1).

27639971 is an equidigital number, since it uses as much as digits as its factorization.

27639971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 142884, while the sum is 44.

The square root of 27639971 is about 5257.3730132073. The cubic root of 27639971 is about 302.3517785793.

The spelling of 27639971 in words is "twenty-seven million, six hundred thirty-nine thousand, nine hundred seventy-one".