16427809 has 2 divisors, whose sum is σ = 16427810. Its totient is φ = 16427808.

The previous prime is 16427759. The next prime is 16427843. The reversal of 16427809 is 90872461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14745600 + 1682209 = 3840^2 + 1297^2 .

It is an emirp because it is prime and its reverse (90872461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16427809 - 2²³ = 8039201 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16427869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8213904 + 8213905.

It is an arithmetic number, because the mean of its divisors is an integer number (8213905).

Almost surely, 2^16427809 is an apocalyptic number.

It is an amenable number.

16427809 is a deficient number, since it is larger than the sum of its proper divisors (1).

16427809 is an equidigital number, since it uses as much as digits as its factorization.

16427809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 16427809 is about 4053.1233635309. The cubic root of 16427809 is about 254.2103420182.

The spelling of 16427809 in words is "sixteen million, four hundred twenty-seven thousand, eight hundred nine".