1722216 has 32 divisors (see below), whose sum is σ = 4368960. Its totient is φ = 565632.

The previous prime is 1722211. The next prime is 1722241. The reversal of 1722216 is 6122271.

It is a junction number, because it is equal to n+sod(n) for n = 1722192 and 1722201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1722211) 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, 1261 + ... + 2243.

It is an arithmetic number, because the mean of its divisors is an integer number (136530).

2^1722216 is an apocalyptic number.

It is an amenable number.

1722216 is an abundant number, since it is smaller than the sum of its proper divisors (2646744).

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

1722216 is a wasteful number, since it uses less digits than its factorization.

1722216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065 (or 1061 counting only the distinct ones).

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

The square root of 1722216 is about 1312.3322749975. The cubic root of 1722216 is about 119.8659614474.

Adding to 1722216 its reverse (6122271), we get a palindrome (7844487).

The spelling of 1722216 in words is "one million, seven hundred twenty-two thousand, two hundred sixteen".