27984005 has 8 divisors (see below), whose sum is σ = 38378112. Its totient is φ = 19189008.

The previous prime is 27983993. The next prime is 27984007. The reversal of 27984005 is 50048972.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 27984005 - 2⁸ = 27983749 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35), and also a Moran number because the ratio is a prime number: 799543 = 27984005 / (2 + 7 + 9 + 8 + 4 + 0 + 0 + 5).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27984007) 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, 399737 + ... + 399806.

It is an arithmetic number, because the mean of its divisors is an integer number (4797264).

Almost surely, 2^27984005 is an apocalyptic number.

It is an amenable number.

27984005 is a deficient number, since it is larger than the sum of its proper divisors (10394107).

27984005 is an equidigital number, since it uses as much as digits as its factorization.

27984005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799555.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 27984005 is about 5289.9910207863. The cubic root of 27984005 is about 303.6010644588.

The spelling of 27984005 in words is "twenty-seven million, nine hundred eighty-four thousand, five".