27405401 has 2 divisors, whose sum is σ = 27405402. Its totient is φ = 27405400.

The previous prime is 27405383. The next prime is 27405403. The reversal of 27405401 is 10450472.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24019801 + 3385600 = 4901^2 + 1840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27405401 is a prime.

It is a Sophie Germain prime.

Together with 27405403, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (27405403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13702700 + 13702701.

It is an arithmetic number, because the mean of its divisors is an integer number (13702701).

Almost surely, 2^27405401 is an apocalyptic number.

It is an amenable number.

27405401 is a deficient number, since it is larger than the sum of its proper divisors (1).

27405401 is an equidigital number, since it uses as much as digits as its factorization.

27405401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 27405401 is about 5235.0168099062. The cubic root of 27405401 is about 301.4940323912.

Adding to 27405401 its reverse (10450472), we get a palindrome (37855873).

The spelling of 27405401 in words is "twenty-seven million, four hundred five thousand, four hundred one".