1725421 has 4 divisors (see below), whose sum is σ = 1772092. Its totient is φ = 1678752.

The previous prime is 1725419. The next prime is 1725463. The reversal of 1725421 is 1245271.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1245271 = 653 ⋅1907.

It can be written as a sum of positive squares in 2 ways, for example, as 1028196 + 697225 = 1014^2 + 835^2 .

It is a cyclic number.

It is not a de Polignac number, because 1725421 - 2¹ = 1725419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1725392 and 1725401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1725481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23280 + ... + 23353.

It is an arithmetic number, because the mean of its divisors is an integer number (443023).

2^1725421 is an apocalyptic number.

It is an amenable number.

1725421 is a deficient number, since it is larger than the sum of its proper divisors (46671).

1725421 is an equidigital number, since it uses as much as digits as its factorization.

1725421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46670.

The product of its digits is 560, while the sum is 22.

The square root of 1725421 is about 1313.5528158395. The cubic root of 1725421 is about 119.9402712014.

The spelling of 1725421 in words is "one million, seven hundred twenty-five thousand, four hundred twenty-one".