27909421 has 4 divisors (see below), whose sum is σ = 28223100. Its totient is φ = 27595744.

The previous prime is 27909407. The next prime is 27909437. The reversal of 27909421 is 12490972.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8008900 + 19900521 = 2830^2 + 4461^2 .

It is a cyclic number.

It is not a de Polignac number, because 27909421 - 2⁵ = 27909389 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 (27909491) 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, 156706 + ... + 156883.

It is an arithmetic number, because the mean of its divisors is an integer number (7055775).

Almost surely, 2^27909421 is an apocalyptic number.

It is an amenable number.

27909421 is a deficient number, since it is larger than the sum of its proper divisors (313679).

27909421 is an equidigital number, since it uses as much as digits as its factorization.

27909421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313678.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 27909421 is about 5282.9367779673. The cubic root of 27909421 is about 303.3311015682.

The spelling of 27909421 in words is "twenty-seven million, nine hundred nine thousand, four hundred twenty-one".