16505012 has 12 divisors (see below), whose sum is σ = 28950180. Its totient is φ = 8233536.

The previous prime is 16505009. The next prime is 16505017. The reversal of 16505012 is 21050561.

It can be written as a sum of positive squares in 2 ways, for example, as 15792676 + 712336 = 3974^2 + 844^2 .

It is a super-2 number, since 2×16505012² = 544830842240288, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16505017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2687 + ... + 6342.

It is an arithmetic number, because the mean of its divisors is an integer number (2412515).

Almost surely, 2^16505012 is an apocalyptic number.

It is an amenable number.

16505012 is a deficient number, since it is larger than the sum of its proper divisors (12445168).

16505012 is a wasteful number, since it uses less digits than its factorization.

16505012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9490 (or 9488 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 16505012 is about 4062.6360900282. The cubic root of 16505012 is about 254.6079429609.

Adding to 16505012 its reverse (21050561), we get a palindrome (37555573).

The spelling of 16505012 in words is "sixteen million, five hundred five thousand, twelve".