27938213 has 4 divisors (see below), whose sum is σ = 28047180. Its totient is φ = 27829248.

The previous prime is 27938159. The next prime is 27938221. The reversal of 27938213 is 31283972.

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

It can be written as a sum of positive squares in 2 ways, for example, as 22259524 + 5678689 = 4718^2 + 2383^2 .

It is a cyclic number.

It is not a de Polignac number, because 27938213 - 2⁶ = 27938149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27938243) 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, 54098 + ... + 54611.

It is an arithmetic number, because the mean of its divisors is an integer number (7011795).

Almost surely, 2^27938213 is an apocalyptic number.

It is an amenable number.

27938213 is a deficient number, since it is larger than the sum of its proper divisors (108967).

27938213 is a wasteful number, since it uses less digits than its factorization.

27938213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108966.

The product of its digits is 18144, while the sum is 35.

The square root of 27938213 is about 5285.6610750217. The cubic root of 27938213 is about 303.4353734981.

The spelling of 27938213 in words is "twenty-seven million, nine hundred thirty-eight thousand, two hundred thirteen".