16621416 has 64 divisors (see below), whose sum is σ = 52771200. Its totient is φ = 4748544.

The previous prime is 16621391. The next prime is 16621417. The reversal of 16621416 is 61412661.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 16621416.

It is not an unprimeable number, because it can be changed into a prime (16621417) 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, 3985 + ... + 7008.

It is an arithmetic number, because the mean of its divisors is an integer number (824550).

Almost surely, 2^16621416 is an apocalyptic number.

It is an amenable number.

16621416 is an abundant number, since it is smaller than the sum of its proper divisors (36149784).

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

16621416 is a wasteful number, since it uses less digits than its factorization.

16621416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11015 (or 11005 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 16621416 is about 4076.9370856073. The cubic root of 16621416 is about 255.2050945154.

The spelling of 16621416 in words is "sixteen million, six hundred twenty-one thousand, four hundred sixteen".