1728442 has 4 divisors (see below), whose sum is σ = 2592666. Its totient is φ = 864220.

The previous prime is 1728439. The next prime is 1728451. The reversal of 1728442 is 2448271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2448271 = 7 ⋅349753.

It can be written as a sum of positive squares in only one way, i.e., 1413721 + 314721 = 1189^2 + 561^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1728442.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432109 + ... + 432112.

2^1728442 is an apocalyptic number.

1728442 is a deficient number, since it is larger than the sum of its proper divisors (864224).

1728442 is an equidigital number, since it uses as much as digits as its factorization.

1728442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864223.

The product of its digits is 3584, while the sum is 28.

The square root of 1728442 is about 1314.7022476591. The cubic root of 1728442 is about 120.0102306092.

The spelling of 1728442 in words is "one million, seven hundred twenty-eight thousand, four hundred forty-two".