1728394 has 8 divisors (see below), whose sum is σ = 2604420. Its totient is φ = 860256.

The previous prime is 1728361. The next prime is 1728403. The reversal of 1728394 is 4938271.

It can be written as a sum of positive squares in 2 ways, for example, as 1595169 + 133225 = 1263^2 + 365^2 .

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

It is a d-powerful number, because it can be written as 1 + 7⁴ + 2¹⁷ + 8³ + 3¹³ + 9² + 4 .

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, 1389 + ... + 2320.

2^1728394 is an apocalyptic number.

1728394 is a deficient number, since it is larger than the sum of its proper divisors (876026).

1728394 is a wasteful number, since it uses less digits than its factorization.

1728394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3944.

The product of its digits is 12096, while the sum is 34.

The square root of 1728394 is about 1314.6839924484. The cubic root of 1728394 is about 120.0091196773.

The spelling of 1728394 in words is "one million, seven hundred twenty-eight thousand, three hundred ninety-four".