27391999 has 2 divisors, whose sum is σ = 27392000. Its totient is φ = 27391998.

The previous prime is 27391993. The next prime is 27392017. The reversal of 27391999 is 99919372.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27391999 - 2⁵ = 27391967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27391993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13695999 + 13696000.

It is an arithmetic number, because the mean of its divisors is an integer number (13696000).

Almost surely, 2^27391999 is an apocalyptic number.

27391999 is a deficient number, since it is larger than the sum of its proper divisors (1).

27391999 is an equidigital number, since it uses as much as digits as its factorization.

27391999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 275562, while the sum is 49.

The square root of 27391999 is about 5233.7366192807. The cubic root of 27391999 is about 301.4448780674. Note that the first 3 decimals are identical.

The spelling of 27391999 in words is "twenty-seven million, three hundred ninety-one thousand, nine hundred ninety-nine".