1773216 has 72 divisors (see below), whose sum is σ = 5189184. Its totient is φ = 574080.

The previous prime is 1773203. The next prime is 1773227. The reversal of 1773216 is 6123771.

It is a tau number, because it is divible by the number of its divisors (72).

It is a self number, because there is not a number n which added to its sum of digits gives 1773216.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13471 + ... + 13601.

It is an arithmetic number, because the mean of its divisors is an integer number (72072).

2^1773216 is an apocalyptic number.

1773216 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 1773216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2594592).

1773216 is an abundant number, since it is smaller than the sum of its proper divisors (3415968).

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

1773216 is a wasteful number, since it uses less digits than its factorization.

1773216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194 (or 183 counting only the distinct ones).

The product of its digits is 1764, while the sum is 27.

The square root of 1773216 is about 1331.6215678638. The cubic root of 1773216 is about 121.0376678482.

Adding to 1773216 its reverse (6123771), we get a palindrome (7896987).

The spelling of 1773216 in words is "one million, seven hundred seventy-three thousand, two hundred sixteen".