16505000 has 40 divisors (see below), whose sum is σ = 38682930. Its totient is φ = 6600000.

The previous prime is 16504993. The next prime is 16505003. The reversal of 16505000 is 50561.

It can be written as a sum of positive squares in 5 ways, for example, as 37636 + 16467364 = 194^2 + 4058^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 16505000.

It is not an unprimeable number, because it can be changed into a prime (16505003) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3350 + ... + 6650.

Almost surely, 2^16505000 is an apocalyptic number.

16505000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16505000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19341465).

16505000 is an abundant number, since it is smaller than the sum of its proper divisors (22177930).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16505000 is an equidigital number, since it uses as much as digits as its factorization.

16505000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3327 (or 3308 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 16505000 is about 4062.6346131544. The cubic root of 16505000 is about 254.6078812565.

Adding to 16505000 its reverse (50561), we get a palindrome (16555561).

The spelling of 16505000 in words is "sixteen million, five hundred five thousand".