16804505 has 8 divisors (see below), whose sum is σ = 20227272. Its totient is φ = 13402368.

The previous prime is 16804499. The next prime is 16804507. The reversal of 16804505 is 50540861.

16804505 = 33² + 34² + ... + 369².

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2704 + 16801801 = 52^2 + 4099^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16804505 - 2¹² = 16800409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16804507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3302 + ... + 6671.

It is an arithmetic number, because the mean of its divisors is an integer number (2528409).

Almost surely, 2^16804505 is an apocalyptic number.

It is an amenable number.

16804505 is a deficient number, since it is larger than the sum of its proper divisors (3422767).

16804505 is an equidigital number, since it uses as much as digits as its factorization.

16804505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10315.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 16804505 is about 4099.3298232760. The cubic root of 16804505 is about 256.1387238449.

The spelling of 16804505 in words is "sixteen million, eight hundred four thousand, five hundred five".