27391639 has 8 divisors (see below), whose sum is σ = 29941632. Its totient is φ = 24851640.

The previous prime is 27391627. The next prime is 27391657. The reversal of 27391639 is 93619372.

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

It is not a de Polignac number, because 27391639 - 2⁹ = 27391127 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 (27391669) 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, 3982 + ... + 8404.

It is an arithmetic number, because the mean of its divisors is an integer number (3742704).

Almost surely, 2^27391639 is an apocalyptic number.

27391639 is a deficient number, since it is larger than the sum of its proper divisors (2549993).

27391639 is a wasteful number, since it uses less digits than its factorization.

27391639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4997.

The product of its digits is 61236, while the sum is 40.

The square root of 27391639 is about 5233.7022269136. The cubic root of 27391639 is about 301.4435574795.

The spelling of 27391639 in words is "twenty-seven million, three hundred ninety-one thousand, six hundred thirty-nine".