1216722 has 32 divisors (see below), whose sum is σ = 2761920. Its totient is φ = 354240.

The previous prime is 1216717. The next prime is 1216729. The reversal of 1216722 is 2276121.

It is not an unprimeable number, because it can be changed into a prime (1216729) 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, 1072 + ... + 1892.

It is an arithmetic number, because the mean of its divisors is an integer number (86310).

2^1216722 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1216722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1380960).

1216722 is an abundant number, since it is smaller than the sum of its proper divisors (1545198).

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

1216722 is a wasteful number, since it uses less digits than its factorization.

1216722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 858.

The product of its digits is 336, while the sum is 21.

The square root of 1216722 is about 1103.0512227453. The cubic root of 1216722 is about 106.7571866157.

The spelling of 1216722 in words is "one million, two hundred sixteen thousand, seven hundred twenty-two".