27921239 has 4 divisors (see below), whose sum is σ = 27952800. Its totient is φ = 27889680.

The previous prime is 27921221. The next prime is 27921263. The reversal of 27921239 is 93212972.

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 27921239 - 2¹⁶ = 27855703 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27921199 and 27921208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27921539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14414 + ... + 16235.

It is an arithmetic number, because the mean of its divisors is an integer number (6988200).

Almost surely, 2^27921239 is an apocalyptic number.

27921239 is a deficient number, since it is larger than the sum of its proper divisors (31561).

27921239 is an equidigital number, since it uses as much as digits as its factorization.

27921239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31560.

The product of its digits is 13608, while the sum is 35.

The square root of 27921239 is about 5284.0551662525. The cubic root of 27921239 is about 303.3739098264.

The spelling of 27921239 in words is "twenty-seven million, nine hundred twenty-one thousand, two hundred thirty-nine".