27821393 has 2 divisors, whose sum is σ = 27821394. Its totient is φ = 27821392.

The previous prime is 27821389. The next prime is 27821413. The reversal of 27821393 is 39312872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18037009 + 9784384 = 4247^2 + 3128^2 .

It is a cyclic number.

It is not a de Polignac number, because 27821393 - 2² = 27821389 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (27821093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13910696 + 13910697.

It is an arithmetic number, because the mean of its divisors is an integer number (13910697).

Almost surely, 2^27821393 is an apocalyptic number.

It is an amenable number.

27821393 is a deficient number, since it is larger than the sum of its proper divisors (1).

27821393 is an equidigital number, since it uses as much as digits as its factorization.

27821393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 35.

The square root of 27821393 is about 5274.5988473058. The cubic root of 27821393 is about 303.0118574874.

The spelling of 27821393 in words is "twenty-seven million, eight hundred twenty-one thousand, three hundred ninety-three".