1722006 has 64 divisors (see below), whose sum is σ = 4515840. Its totient is φ = 479520.

The previous prime is 1721983. The next prime is 1722013. The reversal of 1722006 is 6002271.

It is a happy number.

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 1722006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7611 + ... + 7833.

It is an arithmetic number, because the mean of its divisors is an integer number (70560).

2^1722006 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1722006, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2257920).

1722006 is an abundant number, since it is smaller than the sum of its proper divisors (2793834).

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

1722006 is a wasteful number, since it uses less digits than its factorization.

1722006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258 (or 252 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 1722006 is about 1312.2522623337. The cubic root of 1722006 is about 119.8610892604.

Adding to 1722006 its reverse (6002271), we get a palindrome (7724277).

The spelling of 1722006 in words is "one million, seven hundred twenty-two thousand, six".