1722625 has 8 divisors (see below), whose sum is σ = 2149992. Its totient is φ = 1378000.

The previous prime is 1722619. The next prime is 1722647. The reversal of 1722625 is 5262271.

It can be written as a sum of positive squares in 4 ways, for example, as 53361 + 1669264 = 231^2 + 1292^2 .

It is not a de Polignac number, because 1722625 - 2⁹ = 1722113 is a prime.

It is a hoax number, since the sum of its digits (25) 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 (25).

It is a Duffinian number.

1722625 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1722625.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6766 + ... + 7015.

It is an arithmetic number, because the mean of its divisors is an integer number (268749).

2^1722625 is an apocalyptic number.

It is an amenable number.

1722625 is a deficient number, since it is larger than the sum of its proper divisors (427367).

1722625 is an equidigital number, since it uses as much as digits as its factorization.

1722625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13796 (or 13786 counting only the distinct ones).

The product of its digits is 1680, while the sum is 25.

The square root of 1722625 is about 1312.4880951841. The cubic root of 1722625 is about 119.8754494748.

Adding to 1722625 its reverse (5262271), we get a palindrome (6984896).

The spelling of 1722625 in words is "one million, seven hundred twenty-two thousand, six hundred twenty-five".