27138809 has 8 divisors (see below), whose sum is σ = 28605960. Its totient is φ = 25707136.

The previous prime is 27138799. The next prime is 27138823. The reversal of 27138809 is 90883172.

It can be written as a sum of positive squares in 4 ways, for example, as 2418025 + 24720784 = 1555^2 + 4972^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27138809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27138829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7292 + ... + 10365.

It is an arithmetic number, because the mean of its divisors is an integer number (3575745).

Almost surely, 2^27138809 is an apocalyptic number.

27138809 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

27138809 is a deficient number, since it is larger than the sum of its proper divisors (1467151).

27138809 is a wasteful number, since it uses less digits than its factorization.

27138809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17739.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 27138809 is about 5209.4922017410. The cubic root of 27138809 is about 300.5132288937.

The spelling of 27138809 in words is "twenty-seven million, one hundred thirty-eight thousand, eight hundred nine".