27982309 has 2 divisors, whose sum is σ = 27982310. Its totient is φ = 27982308.

The previous prime is 27982301. The next prime is 27982313. The reversal of 27982309 is 90328972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23251684 + 4730625 = 4822^2 + 2175^2 .

It is a cyclic number.

It is not a de Polignac number, because 27982309 - 2³ = 27982301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27982301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13991154 + 13991155.

It is an arithmetic number, because the mean of its divisors is an integer number (13991155).

Almost surely, 2^27982309 is an apocalyptic number.

It is an amenable number.

27982309 is a deficient number, since it is larger than the sum of its proper divisors (1).

27982309 is an equidigital number, since it uses as much as digits as its factorization.

27982309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 27982309 is about 5289.8307156279. The cubic root of 27982309 is about 303.5949309812.

The spelling of 27982309 in words is "twenty-seven million, nine hundred eighty-two thousand, three hundred nine".