1728881 has 8 divisors (see below), whose sum is σ = 2155584. Its totient is φ = 1347120.

The previous prime is 1728871. The next prime is 1728889. The reversal of 1728881 is 1888271.

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

It is a cyclic number.

It is not a de Polignac number, because 1728881 - 2¹⁴ = 1712497 is a prime.

It is a super-2 number, since 2×1728881² = 5978059024322, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1728889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11150 + ... + 11303.

It is an arithmetic number, because the mean of its divisors is an integer number (269448).

2^1728881 is an apocalyptic number.

1728881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1728881 is a deficient number, since it is larger than the sum of its proper divisors (426703).

1728881 is a wasteful number, since it uses less digits than its factorization.

1728881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22471.

The product of its digits is 7168, while the sum is 35.

The square root of 1728881 is about 1314.8691950152. The cubic root of 1728881 is about 120.0203900537.

The spelling of 1728881 in words is "one million, seven hundred twenty-eight thousand, eight hundred eighty-one".