27984121 has 4 divisors (see below), whose sum is σ = 30528144. Its totient is φ = 25440100.

The previous prime is 27984097. The next prime is 27984127. The reversal of 27984121 is 12148972.

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 27984121 - 2⁷ = 27983993 is a prime.

It is a super-2 number, since 2×27984121² = 1566222056285282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27984127) 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, 1271995 + ... + 1272016.

It is an arithmetic number, because the mean of its divisors is an integer number (7632036).

Almost surely, 2^27984121 is an apocalyptic number.

It is an amenable number.

27984121 is a deficient number, since it is larger than the sum of its proper divisors (2544023).

27984121 is a wasteful number, since it uses less digits than its factorization.

27984121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2544022.

The product of its digits is 8064, while the sum is 34.

The square root of 27984121 is about 5290.0019848768. The cubic root of 27984121 is about 303.6014839565.

The spelling of 27984121 in words is "twenty-seven million, nine hundred eighty-four thousand, one hundred twenty-one".