27987923 has 4 divisors (see below), whose sum is σ = 28008888. Its totient is φ = 27966960.

The previous prime is 27987913. The next prime is 27987937. The reversal of 27987923 is 32978972.

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 27987923 - 2⁸ = 27987667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27987913) 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, 8333 + ... + 11198.

It is an arithmetic number, because the mean of its divisors is an integer number (7002222).

Almost surely, 2^27987923 is an apocalyptic number.

27987923 is a deficient number, since it is larger than the sum of its proper divisors (20965).

27987923 is a wasteful number, since it uses less digits than its factorization.

27987923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20964.

The product of its digits is 381024, while the sum is 47.

The square root of 27987923 is about 5290.3613298148. The cubic root of 27987923 is about 303.6152327127.

The spelling of 27987923 in words is "twenty-seven million, nine hundred eighty-seven thousand, nine hundred twenty-three".