16227809 has 16 divisors (see below), whose sum is σ = 18719568. Its totient is φ = 13934592.

The previous prime is 16227803. The next prime is 16227821. The reversal of 16227809 is 90872261.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 3025 + 16224784 = 55^2 + 4028^2 .

It is a cyclic number.

It is not a de Polignac number, because 16227809 - 2⁸ = 16227553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16227803) 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, 21059 + ... + 21815.

It is an arithmetic number, because the mean of its divisors is an integer number (1169973).

Almost surely, 2^16227809 is an apocalyptic number.

It is an amenable number.

16227809 is a deficient number, since it is larger than the sum of its proper divisors (2491759).

16227809 is a wasteful number, since it uses less digits than its factorization.

16227809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 16227809 is about 4028.3754790238. The cubic root of 16227809 is about 253.1745008916.

The spelling of 16227809 in words is "sixteen million, two hundred twenty-seven thousand, eight hundred nine".