1725981 has 8 divisors (see below), whose sum is σ = 2350464. Its totient is φ = 1126080.

The previous prime is 1725967. The next prime is 1725991. The reversal of 1725981 is 1895271.

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

It is not a de Polignac number, because 1725981 - 2⁹ = 1725469 is a prime.

It is a super-2 number, since 2×1725981² = 5958020824722, which contains 22 as substring.

It is a Curzon number.

1725981 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1725931) 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, 5980 + ... + 6261.

It is an arithmetic number, because the mean of its divisors is an integer number (293808).

2^1725981 is an apocalyptic number.

It is an amenable number.

1725981 is a deficient number, since it is larger than the sum of its proper divisors (624483).

1725981 is a wasteful number, since it uses less digits than its factorization.

1725981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12291.

The product of its digits is 5040, while the sum is 33.

The square root of 1725981 is about 1313.7659608926. The cubic root of 1725981 is about 119.9532456749.

The spelling of 1725981 in words is "one million, seven hundred twenty-five thousand, nine hundred eighty-one".