27939913 has 2 divisors, whose sum is σ = 27939914. Its totient is φ = 27939912.

The previous prime is 27939907. The next prime is 27939943. The reversal of 27939913 is 31993972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27583504 + 356409 = 5252^2 + 597^2 .

It is a cyclic number.

It is not a de Polignac number, because 27939913 - 2⁵ = 27939881 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27939913.

It is not a weakly prime, because it can be changed into another prime (27939943) 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, 13969956 + 13969957.

It is an arithmetic number, because the mean of its divisors is an integer number (13969957).

Almost surely, 2^27939913 is an apocalyptic number.

It is an amenable number.

27939913 is a deficient number, since it is larger than the sum of its proper divisors (1).

27939913 is an equidigital number, since it uses as much as digits as its factorization.

27939913 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 27939913 is about 5285.8218850052. The cubic root of 27939913 is about 303.4415279083.

The spelling of 27939913 in words is "twenty-seven million, nine hundred thirty-nine thousand, nine hundred thirteen".