27912921 has 8 divisors (see below), whose sum is σ = 37547040. Its totient is φ = 18443712.

The previous prime is 27912917. The next prime is 27912947. The reversal of 27912921 is 12921972.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 27912921 - 2² = 27912917 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (27910921) 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, 40831 + ... + 41508.

It is an arithmetic number, because the mean of its divisors is an integer number (4693380).

Almost surely, 2^27912921 is an apocalyptic number.

It is an amenable number.

27912921 is a deficient number, since it is larger than the sum of its proper divisors (9634119).

27912921 is a wasteful number, since it uses less digits than its factorization.

27912921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82455.

The product of its digits is 4536, while the sum is 33.

The square root of 27912921 is about 5283.2680227299. The cubic root of 27912921 is about 303.3437808528.

The spelling of 27912921 in words is "twenty-seven million, nine hundred twelve thousand, nine hundred twenty-one".