27918973 has 2 divisors, whose sum is σ = 27918974. Its totient is φ = 27918972.

The previous prime is 27918971. The next prime is 27918983. The reversal of 27918973 is 37981972.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27426169 + 492804 = 5237^2 + 702^2 .

It is a cyclic number.

It is not a de Polignac number, because 27918973 - 2¹ = 27918971 is a prime.

Together with 27918971, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27918971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13959486 + 13959487.

It is an arithmetic number, because the mean of its divisors is an integer number (13959487).

Almost surely, 2^27918973 is an apocalyptic number.

It is an amenable number.

27918973 is a deficient number, since it is larger than the sum of its proper divisors (1).

27918973 is an equidigital number, since it uses as much as digits as its factorization.

27918973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512, while the sum is 46.

The square root of 27918973 is about 5283.8407432473. The cubic root of 27918973 is about 303.3657026467.

The spelling of 27918973 in words is "twenty-seven million, nine hundred eighteen thousand, nine hundred seventy-three".