2170816 has 28 divisors (see below), whose sum is σ = 4361688. Its totient is φ = 1071872.

The previous prime is 2170813. The next prime is 2170823. The reversal of 2170816 is 6180712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2170813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6690 + ... + 7006.

2^2170816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2170816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2180844).

2170816 is an abundant number, since it is smaller than the sum of its proper divisors (2190872).

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

2170816 is a wasteful number, since it uses less digits than its factorization.

2170816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436 (or 426 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 2170816 is about 1473.3689286801. The cubic root of 2170816 is about 129.4814849078.

The spelling of 2170816 in words is "two million, one hundred seventy thousand, eight hundred sixteen".