1728438 has 16 divisors (see below), whose sum is σ = 3472896. Its totient is φ = 573480.

The previous prime is 1728409. The next prime is 1728439. The reversal of 1728438 is 8348271.

It is a junction number, because it is equal to n+sod(n) for n = 1728399 and 1728408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1728439) 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, 1095 + ... + 2157.

It is an arithmetic number, because the mean of its divisors is an integer number (217056).

2^1728438 is an apocalyptic number.

1728438 is an abundant number, since it is smaller than the sum of its proper divisors (1744458).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1728438 is a wasteful number, since it uses less digits than its factorization.

1728438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1339.

The product of its digits is 10752, while the sum is 33.

The square root of 1728438 is about 1314.7007264013. The cubic root of 1728438 is about 120.0101380324.

The spelling of 1728438 in words is "one million, seven hundred twenty-eight thousand, four hundred thirty-eight".