27921145 has 8 divisors (see below), whose sum is σ = 38291904. Its totient is φ = 19145904.

The previous prime is 27921143. The next prime is 27921151. The reversal of 27921145 is 54112972.

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 27921145 - 2¹ = 27921143 is a prime.

It is a super-2 number, since 2×27921145² = 1559180676222050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (27921143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 398839 + ... + 398908.

It is an arithmetic number, because the mean of its divisors is an integer number (4786488).

Almost surely, 2^27921145 is an apocalyptic number.

It is an amenable number.

27921145 is a deficient number, since it is larger than the sum of its proper divisors (10370759).

27921145 is an equidigital number, since it uses as much as digits as its factorization.

27921145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797759.

The product of its digits is 5040, while the sum is 31.

The square root of 27921145 is about 5284.0462715612. The cubic root of 27921145 is about 303.3735693785.

The spelling of 27921145 in words is "twenty-seven million, nine hundred twenty-one thousand, one hundred forty-five".