27982909 has 2 divisors, whose sum is σ = 27982910. Its totient is φ = 27982908.

The previous prime is 27982897. The next prime is 27982949. The reversal of 27982909 is 90928972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16402500 + 11580409 = 4050^2 + 3403^2 .

It is a cyclic number.

It is not a de Polignac number, because 27982909 - 2¹³ = 27974717 is a prime.

It is a super-2 number, since 2×27982909² = 1566086392204562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27982949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13991454 + 13991455.

It is an arithmetic number, because the mean of its divisors is an integer number (13991455).

Almost surely, 2^27982909 is an apocalyptic number.

It is an amenable number.

27982909 is a deficient number, since it is larger than the sum of its proper divisors (1).

27982909 is an equidigital number, since it uses as much as digits as its factorization.

27982909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 27982909 is about 5289.8874279138. The cubic root of 27982909 is about 303.5971008719.

The spelling of 27982909 in words is "twenty-seven million, nine hundred eighty-two thousand, nine hundred nine".