16180809 has 16 divisors (see below), whose sum is σ = 22161600. Its totient is φ = 10497536.

The previous prime is 16180789. The next prime is 16180841. The reversal of 16180809 is 90808161.

16180809 = 147² + 148² + ... + 372².

It is a cyclic number.

It is not a de Polignac number, because 16180809 - 2⁸ = 16180553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16180809.

It is not an unprimeable number, because it can be changed into a prime (16180849) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19597 + ... + 20405.

It is an arithmetic number, because the mean of its divisors is an integer number (1385100).

Almost surely, 2^16180809 is an apocalyptic number.

It is an amenable number.

16180809 is a deficient number, since it is larger than the sum of its proper divisors (5980791).

16180809 is a wasteful number, since it uses less digits than its factorization.

16180809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 984.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 16180809 is about 4022.5376318936. The cubic root of 16180809 is about 252.9298445776.

The spelling of 16180809 in words is "sixteen million, one hundred eighty thousand, eight hundred nine".