16499409 has 24 divisors (see below), whose sum is σ = 23355360. Its totient is φ = 10356480.

The previous prime is 16499393. The next prime is 16499419. The reversal of 16499409 is 90499461.

It is not a de Polignac number, because 16499409 - 2⁴ = 16499393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16499419) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 170049 + ... + 170145.

It is an arithmetic number, because the mean of its divisors is an integer number (973140).

Almost surely, 2^16499409 is an apocalyptic number.

It is an amenable number.

16499409 is a deficient number, since it is larger than the sum of its proper divisors (6855951).

16499409 is an equidigital number, since it uses as much as digits as its factorization.

16499409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221 (or 190 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 16499409 is about 4061.9464545954. The cubic root of 16499409 is about 254.5791288899.

The spelling of 16499409 in words is "sixteen million, four hundred ninety-nine thousand, four hundred nine".