1725681 has 8 divisors (see below), whose sum is σ = 2315680. Its totient is φ = 1143072.

The previous prime is 1725671. The next prime is 1725683. The reversal of 1725681 is 1865271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1725681 - 2⁶ = 1725617 is a prime.

It is a super-2 number, since 2×1725681² = 5955949827522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

1725681 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1725683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1276 + ... + 2253.

It is an arithmetic number, because the mean of its divisors is an integer number (289460).

2^1725681 is an apocalyptic number.

It is an amenable number.

1725681 is a deficient number, since it is larger than the sum of its proper divisors (589999).

1725681 is a wasteful number, since it uses less digits than its factorization.

1725681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3695.

The product of its digits is 3360, while the sum is 30.

The square root of 1725681 is about 1313.6517803436. The cubic root of 1725681 is about 119.9462954132.

The spelling of 1725681 in words is "one million, seven hundred twenty-five thousand, six hundred eighty-one".