16499640 has 64 divisors (see below), whose sum is σ = 49766400. Its totient is φ = 4376192.

The previous prime is 16499629. The next prime is 16499641. The reversal of 16499640 is 4699461.

16499640 is a nontrivial binomial coefficient, being equal to C(5745, 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16499641) 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, 42889 + ... + 43271.

It is an arithmetic number, because the mean of its divisors is an integer number (777600).

Almost surely, 2^16499640 is an apocalyptic number.

16499640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16499640 is the 5744-th triangular number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16499640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24883200).

16499640 is an abundant number, since it is smaller than the sum of its proper divisors (33266760).

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

16499640 is a wasteful number, since it uses less digits than its factorization.

16499640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756 (or 752 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 16499640 is about 4061.9748891395. The cubic root of 16499640 is about 254.5803169628.

The spelling of 16499640 in words is "sixteen million, four hundred ninety-nine thousand, six hundred forty".