1728081 has 16 divisors (see below), whose sum is σ = 2649600. Its totient is φ = 1111824.

The previous prime is 1728071. The next prime is 1728091. The reversal of 1728081 is 1808271.

It is an interprime number because it is at equal distance from previous prime (1728071) and next prime (1728091).

It is not a de Polignac number, because 1728081 - 2⁶ = 1728017 is a prime.

It is a super-2 number, since 2×1728081² = 5972527885122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1728061) 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 15 ways as a sum of consecutive naturals, for example, 321 + ... + 1886.

It is an arithmetic number, because the mean of its divisors is an integer number (165600).

2^1728081 is an apocalyptic number.

It is an amenable number.

1728081 is a deficient number, since it is larger than the sum of its proper divisors (921519).

1728081 is a wasteful number, since it uses less digits than its factorization.

1728081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2245 (or 2239 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 1728081 is about 1314.5649470452. The cubic root of 1728081 is about 120.0018749707.

The spelling of 1728081 in words is "one million, seven hundred twenty-eight thousand, eighty-one".