27990917 has 2 divisors, whose sum is σ = 27990918. Its totient is φ = 27990916.

The previous prime is 27990913. The next prime is 27990929. The reversal of 27990917 is 71909972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25411681 + 2579236 = 5041^2 + 1606^2 .

It is a cyclic number.

It is not a de Polignac number, because 27990917 - 2² = 27990913 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27990913) 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, 13995458 + 13995459.

It is an arithmetic number, because the mean of its divisors is an integer number (13995459).

Almost surely, 2^27990917 is an apocalyptic number.

It is an amenable number.

27990917 is a deficient number, since it is larger than the sum of its proper divisors (1).

27990917 is an equidigital number, since it uses as much as digits as its factorization.

27990917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 71442, while the sum is 44.

The square root of 27990917 is about 5290.6442896872. The cubic root of 27990917 is about 303.6260587107.

The spelling of 27990917 in words is "twenty-seven million, nine hundred ninety thousand, nine hundred seventeen".