27999409 has 2 divisors, whose sum is σ = 27999410. Its totient is φ = 27999408.

The previous prime is 27999401. The next prime is 27999421. The reversal of 27999409 is 90499972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26296384 + 1703025 = 5128^2 + 1305^2 .

It is a cyclic number.

It is not a de Polignac number, because 27999409 - 2³ = 27999401 is a prime.

It is not a weakly prime, because it can be changed into another prime (27999401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13999704 + 13999705.

It is an arithmetic number, because the mean of its divisors is an integer number (13999705).

Almost surely, 2^27999409 is an apocalyptic number.

It is an amenable number.

27999409 is a deficient number, since it is larger than the sum of its proper divisors (1).

27999409 is an equidigital number, since it uses as much as digits as its factorization.

27999409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 367416, while the sum is 49.

The square root of 27999409 is about 5291.4467775836. The cubic root of 27999409 is about 303.6567607153.

The spelling of 27999409 in words is "twenty-seven million, nine hundred ninety-nine thousand, four hundred nine".