27943957 has 2 divisors, whose sum is σ = 27943958. Its totient is φ = 27943956.

The previous prime is 27943931. The next prime is 27943961. The reversal of 27943957 is 75934972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27815076 + 128881 = 5274^2 + 359^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27943957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27943057) 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, 13971978 + 13971979.

It is an arithmetic number, because the mean of its divisors is an integer number (13971979).

Almost surely, 2^27943957 is an apocalyptic number.

It is an amenable number.

27943957 is a deficient number, since it is larger than the sum of its proper divisors (1).

27943957 is an equidigital number, since it uses as much as digits as its factorization.

27943957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 476280, while the sum is 46.

The square root of 27943957 is about 5286.2044039178. The cubic root of 27943957 is about 303.4561671610.

It can be divided in two parts, 27943 and 957, that added together give a square (28900 = 170²).

The spelling of 27943957 in words is "twenty-seven million, nine hundred forty-three thousand, nine hundred fifty-seven".