1605216 has 48 divisors (see below), whose sum is σ = 4402944. Its totient is φ = 511104.

The previous prime is 1605209. The next prime is 1605217. The reversal of 1605216 is 6125061.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 1605192 and 1605201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1605217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1845 + ... + 2571.

It is an arithmetic number, because the mean of its divisors is an integer number (91728).

2^1605216 is an apocalyptic number.

1605216 is a gapful number since it is divisible by the number (16) 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 1605216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2201472).

1605216 is an abundant number, since it is smaller than the sum of its proper divisors (2797728).

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

1605216 is a wasteful number, since it uses less digits than its factorization.

1605216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763 (or 755 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 1605216 is about 1266.9711914641. The cubic root of 1605216 is about 117.0876689701.

The spelling of 1605216 in words is "one million, six hundred five thousand, two hundred sixteen".