27940021 has 8 divisors (see below), whose sum is σ = 29836800. Its totient is φ = 26105520.

The previous prime is 27939997. The next prime is 27940039. The reversal of 27940021 is 12004972.

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 27940021 - 2¹⁹ = 27415733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27940321) 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 7 ways as a sum of consecutive naturals, for example, 14641 + ... + 16438.

It is an arithmetic number, because the mean of its divisors is an integer number (3729600).

Almost surely, 2^27940021 is an apocalyptic number.

It is an amenable number.

27940021 is a deficient number, since it is larger than the sum of its proper divisors (1896779).

27940021 is a wasteful number, since it uses less digits than its factorization.

27940021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31139.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 27940021 is about 5285.8321010036. The cubic root of 27940021 is about 303.4419188859.

Adding to 27940021 its reverse (12004972), we get a palindrome (39944993).

The spelling of 27940021 in words is "twenty-seven million, nine hundred forty thousand, twenty-one".