27289921 has 2 divisors, whose sum is σ = 27289922. Its totient is φ = 27289920.

The previous prime is 27289903. The next prime is 27289931. The reversal of 27289921 is 12998272.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21715600 + 5574321 = 4660^2 + 2361^2 .

It is a cyclic number.

It is not a de Polignac number, because 27289921 - 2⁷ = 27289793 is a prime.

It is not a weakly prime, because it can be changed into another prime (27289901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13644960 + 13644961.

It is an arithmetic number, because the mean of its divisors is an integer number (13644961).

Almost surely, 2^27289921 is an apocalyptic number.

It is an amenable number.

27289921 is a deficient number, since it is larger than the sum of its proper divisors (1).

27289921 is an equidigital number, since it uses as much as digits as its factorization.

27289921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 40.

The square root of 27289921 is about 5223.9755933580. The cubic root of 27289921 is about 301.0699608904.

The spelling of 27289921 in words is "twenty-seven million, two hundred eighty-nine thousand, nine hundred twenty-one".