27638389 has 2 divisors, whose sum is σ = 27638390. Its totient is φ = 27638388.

The previous prime is 27638339. The next prime is 27638399. The reversal of 27638389 is 98383672.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17766225 + 9872164 = 4215^2 + 3142^2 .

It is a cyclic number.

It is not a de Polignac number, because 27638389 - 2⁹ = 27637877 is a prime.

It is a super-3 number, since 3×27638389³ (a number of 23 digits) contains 333 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27638309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13819194 + 13819195.

It is an arithmetic number, because the mean of its divisors is an integer number (13819195).

Almost surely, 2^27638389 is an apocalyptic number.

It is an amenable number.

27638389 is a deficient number, since it is larger than the sum of its proper divisors (1).

27638389 is an equidigital number, since it uses as much as digits as its factorization.

27638389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 46.

The square root of 27638389 is about 5257.2225556847. Note that the first 3 decimals coincide. The cubic root of 27638389 is about 302.3460100054.

The spelling of 27638389 in words is "twenty-seven million, six hundred thirty-eight thousand, three hundred eighty-nine".