27397799839 has 4 divisors (see below), whose sum is σ = 27398177824. Its totient is φ = 27397421856.

The previous prime is 27397799837. The next prime is 27397799843. The reversal of 27397799839 is 93899779372.

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 27397799839 - 2¹ = 27397799837 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 (27397799837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42327 + ... + 237880.

It is an arithmetic number, because the mean of its divisors is an integer number (6849544456).

Almost surely, 2^27397799839 is an apocalyptic number.

27397799839 is a deficient number, since it is larger than the sum of its proper divisors (377985).

27397799839 is an equidigital number, since it uses as much as digits as its factorization.

27397799839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377984.

The product of its digits is 324060912, while the sum is 73.

The spelling of 27397799839 in words is "twenty-seven billion, three hundred ninety-seven million, seven hundred ninety-nine thousand, eight hundred thirty-nine".