27381397 has 2 divisors, whose sum is σ = 27381398. Its totient is φ = 27381396.

The previous prime is 27381391. The next prime is 27381427. The reversal of 27381397 is 79318372.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17230801 + 10150596 = 4151^2 + 3186^2 .

It is a cyclic number.

It is not a de Polignac number, because 27381397 - 2²³ = 18992789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27381391) 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, 13690698 + 13690699.

It is an arithmetic number, because the mean of its divisors is an integer number (13690699).

Almost surely, 2^27381397 is an apocalyptic number.

It is an amenable number.

27381397 is a deficient number, since it is larger than the sum of its proper divisors (1).

27381397 is an equidigital number, since it uses as much as digits as its factorization.

27381397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 40.

The square root of 27381397 is about 5232.7236693714. The cubic root of 27381397 is about 301.4059819040.

The spelling of 27381397 in words is "twenty-seven million, three hundred eighty-one thousand, three hundred ninety-seven".