16435809 has 12 divisors (see below), whose sum is σ = 25566996. Its totient is φ = 10114272.

The previous prime is 16435801. The next prime is 16435819. The reversal of 16435809 is 90853461.

16435809 is a `hidden beast` number, since 1 + 643 + 5 + 8 + 0 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1782225 + 14653584 = 1335^2 + 3828^2 .

It is not a de Polignac number, because 16435809 - 2³ = 16435801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16435801) 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 in 11 ways as a sum of consecutive naturals, for example, 70122 + ... + 70355.

It is an arithmetic number, because the mean of its divisors is an integer number (2130583).

Almost surely, 2^16435809 is an apocalyptic number.

It is an amenable number.

16435809 is a deficient number, since it is larger than the sum of its proper divisors (9131187).

16435809 is a wasteful number, since it uses less digits than its factorization.

16435809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140496 (or 140493 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 16435809 is about 4054.1101366391. The cubic root of 16435809 is about 254.2516003647.

The spelling of 16435809 in words is "sixteen million, four hundred thirty-five thousand, eight hundred nine".