27798409 has 2 divisors, whose sum is σ = 27798410. Its totient is φ = 27798408.

The previous prime is 27798403. The next prime is 27798427. The reversal of 27798409 is 90489772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18361225 + 9437184 = 4285^2 + 3072^2 .

It is a cyclic number.

It is not a de Polignac number, because 27798409 - 2³ = 27798401 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27798401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13899204 + 13899205.

It is an arithmetic number, because the mean of its divisors is an integer number (13899205).

Almost surely, 2^27798409 is an apocalyptic number.

It is an amenable number.

27798409 is a deficient number, since it is larger than the sum of its proper divisors (1).

27798409 is an equidigital number, since it uses as much as digits as its factorization.

27798409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 27798409 is about 5272.4196532522. The cubic root of 27798409 is about 302.9283924210.

The spelling of 27798409 in words is "twenty-seven million, seven hundred ninety-eight thousand, four hundred nine".