27681943 has 4 divisors (see below), whose sum is σ = 27708408. Its totient is φ = 27655480.

The previous prime is 27681931. The next prime is 27681947. The reversal of 27681943 is 34918672.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 27681943 - 2¹⁷ = 27550871 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27681896 and 27681905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27681947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11596 + ... + 13777.

It is an arithmetic number, because the mean of its divisors is an integer number (6927102).

Almost surely, 2^27681943 is an apocalyptic number.

27681943 is a deficient number, since it is larger than the sum of its proper divisors (26465).

27681943 is a wasteful number, since it uses less digits than its factorization.

27681943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26464.

The product of its digits is 72576, while the sum is 40.

The square root of 27681943 is about 5261.3632263891. The cubic root of 27681943 is about 302.5047441371.

The spelling of 27681943 in words is "twenty-seven million, six hundred eighty-one thousand, nine hundred forty-three".