27921373 has 2 divisors, whose sum is σ = 27921374. Its totient is φ = 27921372.

The previous prime is 27921371. The next prime is 27921391. The reversal of 27921373 is 37312972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21780889 + 6140484 = 4667^2 + 2478^2 .

It is a cyclic number.

It is not a de Polignac number, because 27921373 - 2¹ = 27921371 is a prime.

Together with 27921371, 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 (27921371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13960686 + 13960687.

It is an arithmetic number, because the mean of its divisors is an integer number (13960687).

Almost surely, 2^27921373 is an apocalyptic number.

It is an amenable number.

27921373 is a deficient number, since it is larger than the sum of its proper divisors (1).

27921373 is an equidigital number, since it uses as much as digits as its factorization.

27921373 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15876, while the sum is 34.

The square root of 27921373 is about 5284.0678458930. The cubic root of 27921373 is about 303.3743951444.

The spelling of 27921373 in words is "twenty-seven million, nine hundred twenty-one thousand, three hundred seventy-three".