1728490 has 8 divisors (see below), whose sum is σ = 3111300. Its totient is φ = 691392.

The previous prime is 1728481. The next prime is 1728511. The reversal of 1728490 is 948271.

It can be written as a sum of positive squares in 2 ways, for example, as 1605289 + 123201 = 1267^2 + 351^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86415 + ... + 86434.

2^1728490 is an apocalyptic number.

1728490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1728490 is a deficient number, since it is larger than the sum of its proper divisors (1382810).

1728490 is a wasteful number, since it uses less digits than its factorization.

1728490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172856.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 1728490 is about 1314.7205026164. The cubic root of 1728490 is about 120.0113415206.

The spelling of 1728490 in words is "one million, seven hundred twenty-eight thousand, four hundred ninety".