27391993 has 2 divisors, whose sum is σ = 27391994. Its totient is φ = 27391992.

The previous prime is 27391967. The next prime is 27391999. The reversal of 27391993 is 39919372.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25280784 + 2111209 = 5028^2 + 1453^2 .

It is a cyclic number.

It is not a de Polignac number, because 27391993 - 2⁵ = 27391961 is a prime.

It is not a weakly prime, because it can be changed into another prime (27391999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13695996 + 13695997.

It is an arithmetic number, because the mean of its divisors is an integer number (13695997).

Almost surely, 2^27391993 is an apocalyptic number.

It is an amenable number.

27391993 is a deficient number, since it is larger than the sum of its proper divisors (1).

27391993 is an equidigital number, since it uses as much as digits as its factorization.

27391993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 91854, while the sum is 43.

The square root of 27391993 is about 5233.7360460765. The cubic root of 27391993 is about 301.4448560577. Note that the first 3 decimals are identical.

The spelling of 27391993 in words is "twenty-seven million, three hundred ninety-one thousand, nine hundred ninety-three".