27139447 has 4 divisors (see below), whose sum is σ = 28075320. Its totient is φ = 26203576.

The previous prime is 27139403. The next prime is 27139451. The reversal of 27139447 is 74493172.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27139447 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 (27139247) 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, 467893 + ... + 467950.

It is an arithmetic number, because the mean of its divisors is an integer number (7018830).

Almost surely, 2^27139447 is an apocalyptic number.

27139447 is a deficient number, since it is larger than the sum of its proper divisors (935873).

27139447 is an equidigital number, since it uses as much as digits as its factorization.

27139447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935872.

The product of its digits is 42336, while the sum is 37.

The square root of 27139447 is about 5209.5534357563. The cubic root of 27139447 is about 300.5155837740.

It can be divided in two parts, 271394 and 47, that added together give a square (271441 = 521²).

The spelling of 27139447 in words is "twenty-seven million, one hundred thirty-nine thousand, four hundred forty-seven".