16509012 has 48 divisors (see below), whose sum is σ = 41950272. Its totient is φ = 5022720.

The previous prime is 16509011. The next prime is 16509037. The reversal of 16509012 is 21090561.

It is a super-2 number, since 2×16509012² = 545094954432288, 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 (16509011) 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, 14587 + ... + 15677.

It is an arithmetic number, because the mean of its divisors is an integer number (873964).

Almost surely, 2^16509012 is an apocalyptic number.

16509012 is a gapful number since it is divisible by the number (12) 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 16509012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20975136).

16509012 is an abundant number, since it is smaller than the sum of its proper divisors (25441260).

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

16509012 is a wasteful number, since it uses less digits than its factorization.

16509012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1208 (or 1206 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 16509012 is about 4063.1283514061. The cubic root of 16509012 is about 254.6285094310.

Adding to 16509012 its reverse (21090561), we get a palindrome (37599573).

The spelling of 16509012 in words is "sixteen million, five hundred nine thousand, twelve".