27940905 has 12 divisors (see below), whose sum is σ = 48430980. Its totient is φ = 14901792.

The previous prime is 27940903. The next prime is 27940907. The reversal of 27940905 is 50904972.

It is an interprime number because it is at equal distance from previous prime (27940903) and next prime (27940907).

It can be written as a sum of positive squares in 2 ways, for example, as 18429849 + 9511056 = 4293^2 + 3084^2 .

It is not a de Polignac number, because 27940905 - 2¹ = 27940903 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27940905.

It is not an unprimeable number, because it can be changed into a prime (27940901) 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 in 11 ways as a sum of consecutive naturals, for example, 310410 + ... + 310499.

It is an arithmetic number, because the mean of its divisors is an integer number (4035915).

Almost surely, 2^27940905 is an apocalyptic number.

It is an amenable number.

27940905 is a deficient number, since it is larger than the sum of its proper divisors (20490075).

27940905 is a wasteful number, since it uses less digits than its factorization.

27940905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620920 (or 620917 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 27940905 is about 5285.9157201000. The cubic root of 27940905 is about 303.4451190723.

The spelling of 27940905 in words is "twenty-seven million, nine hundred forty thousand, nine hundred five".