27939821 has 8 divisors (see below), whose sum is σ = 34387584. Its totient is φ = 22106160.

The previous prime is 27939797. The next prime is 27939869. The reversal of 27939821 is 12893972.

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 a de Polignac number, because none of the positive numbers 2^k-27939821 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27939881) 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, 153425 + ... + 153606.

It is an arithmetic number, because the mean of its divisors is an integer number (4298448).

Almost surely, 2^27939821 is an apocalyptic number.

It is an amenable number.

27939821 is a deficient number, since it is larger than the sum of its proper divisors (6447763).

27939821 is a wasteful number, since it uses less digits than its factorization.

27939821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307051.

The product of its digits is 54432, while the sum is 41.

The square root of 27939821 is about 5285.8131824725. The cubic root of 27939821 is about 303.4411948525.

The spelling of 27939821 in words is "twenty-seven million, nine hundred thirty-nine thousand, eight hundred twenty-one".