1728890 has 16 divisors (see below), whose sum is σ = 3151008. Its totient is φ = 682896.

The previous prime is 1728889. The next prime is 1728907. The reversal of 1728890 is 988271.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1728890.

It is an unprimeable number.

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, 212 + ... + 1871.

It is an arithmetic number, because the mean of its divisors is an integer number (196938).

2^1728890 is an apocalyptic number.

1728890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1728890 is a deficient number, since it is larger than the sum of its proper divisors (1422118).

1728890 is a wasteful number, since it uses less digits than its factorization.

1728890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2173.

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 1728890 is about 1314.8726174044. The cubic root of 1728890 is about 120.0205983159.

The spelling of 1728890 in words is "one million, seven hundred twenty-eight thousand, eight hundred ninety".