27949421 has 4 divisors (see below), whose sum is σ = 28423200. Its totient is φ = 27475644.

The previous prime is 27949403. The next prime is 27949423. The reversal of 27949421 is 12494972.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 27949421 - 2⁶ = 27949357 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 (27949423) 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, 236801 + ... + 236918.

It is an arithmetic number, because the mean of its divisors is an integer number (7105800).

Almost surely, 2^27949421 is an apocalyptic number.

It is an amenable number.

27949421 is a deficient number, since it is larger than the sum of its proper divisors (473779).

27949421 is an equidigital number, since it uses as much as digits as its factorization.

27949421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473778.

The product of its digits is 36288, while the sum is 38.

The square root of 27949421 is about 5286.7211955994. The cubic root of 27949421 is about 303.4759445609.

The spelling of 27949421 in words is "twenty-seven million, nine hundred forty-nine thousand, four hundred twenty-one".