1722368 has 36 divisors (see below), whose sum is σ = 3566745. Its totient is φ = 831488.

The previous prime is 1722359. The next prime is 1722373. The reversal of 1722368 is 8632271.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 1721344 + 1024 = 1312^2 + 32^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=928.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a nialpdrome in base 8.

It is a self number, because there is not a number n which added to its sum of digits gives 1722368.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 59378 + ... + 59406.

2^1722368 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 1722368

1722368 is an abundant number, since it is smaller than the sum of its proper divisors (1844377).

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

1722368 is an frugal number, since it uses more digits than its factorization.

1722368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80 (or 31 counting only the distinct ones).

The product of its digits is 4032, while the sum is 29.

The square root of 1722368 is about 1312.3901858822. The cubic root of 1722368 is about 119.8694877357.

Subtracting 1722368 from its reverse (8632271), we obtain a triangular number (6909903 = T₃₇₁₇).

The spelling of 1722368 in words is "one million, seven hundred twenty-two thousand, three hundred sixty-eight".