27984917 has 2 divisors, whose sum is σ = 27984918. Its totient is φ = 27984916.

The previous prime is 27984899. The next prime is 27984923. The reversal of 27984917 is 71948972.

27984917 is nontrivially palindromic in base 15.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22791076 + 5193841 = 4774^2 + 2279^2 .

It is a cyclic number.

It is not a de Polignac number, because 27984917 - 2²⁰ = 26936341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27984937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13992458 + 13992459.

It is an arithmetic number, because the mean of its divisors is an integer number (13992459).

Almost surely, 2^27984917 is an apocalyptic number.

It is an amenable number.

27984917 is a deficient number, since it is larger than the sum of its proper divisors (1).

27984917 is an equidigital number, since it uses as much as digits as its factorization.

27984917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016, while the sum is 47.

The square root of 27984917 is about 5290.0772206084. The cubic root of 27984917 is about 303.6043625472.

The spelling of 27984917 in words is "twenty-seven million, nine hundred eighty-four thousand, nine hundred seventeen".