27400643 has 2 divisors, whose sum is σ = 27400644. Its totient is φ = 27400642.

The previous prime is 27400627. The next prime is 27400661. The reversal of 27400643 is 34600472.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27400643 - 2⁴ = 27400627 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27400663) 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, 13700321 + 13700322.

It is an arithmetic number, because the mean of its divisors is an integer number (13700322).

Almost surely, 2^27400643 is an apocalyptic number.

27400643 is a deficient number, since it is larger than the sum of its proper divisors (1).

27400643 is an equidigital number, since it uses as much as digits as its factorization.

27400643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 26.

The square root of 27400643 is about 5234.5623503785. The cubic root of 27400643 is about 301.4765833777.

The spelling of 27400643 in words is "twenty-seven million, four hundred thousand, six hundred forty-three".