16216506 has 12 divisors (see below), whose sum is σ = 35135802. Its totient is φ = 5405496.

The previous prime is 16216493. The next prime is 16216507. The reversal of 16216506 is 60561261.

It is a happy number.

16216506 is a `hidden beast` number, since 1 + 6 + 2 + 1 + 650 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 10949481 + 5267025 = 3309^2 + 2295^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 16216506.

It is not an unprimeable number, because it can be changed into a prime (16216507) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 450441 + ... + 450476.

Almost surely, 2^16216506 is an apocalyptic number.

16216506 is an abundant number, since it is smaller than the sum of its proper divisors (18919296).

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

16216506 is a wasteful number, since it uses less digits than its factorization.

16216506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900925 (or 900922 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 16216506 is about 4026.9723117995. The cubic root of 16216506 is about 253.1157068376.

Adding to 16216506 its reverse (60561261), we get a palindrome (76777767).

The spelling of 16216506 in words is "sixteen million, two hundred sixteen thousand, five hundred six".