1721325 has 24 divisors (see below), whose sum is σ = 2901600. Its totient is φ = 900160.

The previous prime is 1721323. The next prime is 1721327. The reversal of 1721325 is 5231271.

It is an interprime number because it is at equal distance from previous prime (1721323) and next prime (1721327).

It is not a de Polignac number, because 1721325 - 2¹ = 1721323 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1721323) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4231 + ... + 4619.

It is an arithmetic number, because the mean of its divisors is an integer number (120900).

2^1721325 is an apocalyptic number.

1721325 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1721325 is a deficient number, since it is larger than the sum of its proper divisors (1180275).

1721325 is a wasteful number, since it uses less digits than its factorization.

1721325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461 (or 456 counting only the distinct ones).

The product of its digits is 420, while the sum is 21.

The square root of 1721325 is about 1311.9927591264. The cubic root of 1721325 is about 119.8452867285.

Adding to 1721325 its reverse (5231271), we get a palindrome (6952596).

The spelling of 1721325 in words is "one million, seven hundred twenty-one thousand, three hundred twenty-five".