16403809 has 2 divisors, whose sum is σ = 16403810. Its totient is φ = 16403808.

The previous prime is 16403801. The next prime is 16403843. The reversal of 16403809 is 90830461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16378209 + 25600 = 4047^2 + 160^2 .

It is a cyclic number.

It is not a de Polignac number, because 16403809 - 2³ = 16403801 is a prime.

It is not a weakly prime, because it can be changed into another prime (16403801) 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, 8201904 + 8201905.

It is an arithmetic number, because the mean of its divisors is an integer number (8201905).

Almost surely, 2^16403809 is an apocalyptic number.

It is an amenable number.

16403809 is a deficient number, since it is larger than the sum of its proper divisors (1).

16403809 is an equidigital number, since it uses as much as digits as its factorization.

16403809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 16403809 is about 4050.1616017142. The cubic root of 16403809 is about 254.0864865545.

The spelling of 16403809 in words is "sixteen million, four hundred three thousand, eight hundred nine".