27993913 has 2 divisors, whose sum is σ = 27993914. Its totient is φ = 27993912.

The previous prime is 27993877. The next prime is 27993923. The reversal of 27993913 is 31939972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25080064 + 2913849 = 5008^2 + 1707^2 .

It is a cyclic number.

It is not a de Polignac number, because 27993913 - 2¹⁷ = 27862841 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27993913.

It is not a weakly prime, because it can be changed into another prime (27993923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13996956 + 13996957.

It is an arithmetic number, because the mean of its divisors is an integer number (13996957).

Almost surely, 2^27993913 is an apocalyptic number.

It is an amenable number.

27993913 is a deficient number, since it is larger than the sum of its proper divisors (1).

27993913 is an equidigital number, since it uses as much as digits as its factorization.

27993913 is an evil number, because the sum of its binary digits is even.

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

The square root of 27993913 is about 5290.9274234297. The cubic root of 27993913 is about 303.6368911678.

The spelling of 27993913 in words is "twenty-seven million, nine hundred ninety-three thousand, nine hundred thirteen".