27138471 has 4 divisors (see below), whose sum is σ = 36184632. Its totient is φ = 18092312.

The previous prime is 27138469. The next prime is 27138481. The reversal of 27138471 is 17483172.

It is a happy number.

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 27138471 - 2¹ = 27138469 is a prime.

It is a super-3 number, since 3×27138471³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27138421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4523076 + ... + 4523081.

It is an arithmetic number, because the mean of its divisors is an integer number (9046158).

Almost surely, 2^27138471 is an apocalyptic number.

27138471 is a deficient number, since it is larger than the sum of its proper divisors (9046161).

27138471 is an equidigital number, since it uses as much as digits as its factorization.

27138471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9046160.

The product of its digits is 9408, while the sum is 33.

The square root of 27138471 is about 5209.4597608581. The cubic root of 27138471 is about 300.5119813090.

The spelling of 27138471 in words is "twenty-seven million, one hundred thirty-eight thousand, four hundred seventy-one".