16646406 has 64 divisors (see below), whose sum is σ = 40089600. Its totient is φ = 4507776.

The previous prime is 16646401. The next prime is 16646431. The reversal of 16646406 is 60464661.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16646401) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 96136 + ... + 96308.

It is an arithmetic number, because the mean of its divisors is an integer number (626400).

Almost surely, 2^16646406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16646406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20044800).

16646406 is an abundant number, since it is smaller than the sum of its proper divisors (23443194).

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

16646406 is a wasteful number, since it uses less digits than its factorization.

16646406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293.

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 16646406 is about 4080.0007352941. Note that the first 3 decimals coincide. The cubic root of 16646406 is about 255.3329292276.

The spelling of 16646406 in words is "sixteen million, six hundred forty-six thousand, four hundred six".