27378979 has 4 divisors (see below), whose sum is σ = 27650160. Its totient is φ = 27107800.

The previous prime is 27378977. The next prime is 27378997. The reversal of 27378979 is 97987372.

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 27378979 - 2¹ = 27378977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27378977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135439 + ... + 135640.

It is an arithmetic number, because the mean of its divisors is an integer number (6912540).

Almost surely, 2^27378979 is an apocalyptic number.

27378979 is a deficient number, since it is larger than the sum of its proper divisors (271181).

27378979 is a wasteful number, since it uses less digits than its factorization.

27378979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271180.

The product of its digits is 1333584, while the sum is 52.

The square root of 27378979 is about 5232.4926182461. The cubic root of 27378979 is about 301.3971094431.

The spelling of 27378979 in words is "twenty-seven million, three hundred seventy-eight thousand, nine hundred seventy-nine".