27921389 has 8 divisors (see below), whose sum is σ = 28408320. Its totient is φ = 27437200.

The previous prime is 27921373. The next prime is 27921391. The reversal of 27921389 is 98312972.

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 27921389 - 2⁴ = 27921373 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 (27921589) 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, 33599 + ... + 34419.

It is an arithmetic number, because the mean of its divisors is an integer number (3551040).

Almost surely, 2^27921389 is an apocalyptic number.

It is an amenable number.

27921389 is a deficient number, since it is larger than the sum of its proper divisors (486931).

27921389 is an equidigital number, since it uses as much as digits as its factorization.

27921389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1371.

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

The square root of 27921389 is about 5284.0693598779. The cubic root of 27921389 is about 303.3744530927.

The spelling of 27921389 in words is "twenty-seven million, nine hundred twenty-one thousand, three hundred eighty-nine".