1731428 has 6 divisors (see below), whose sum is σ = 3030006. Its totient is φ = 865712.

The previous prime is 1731421. The next prime is 1731437. The reversal of 1731428 is 8241371.

It can be written as a sum of positive squares in only one way, i.e., 1493284 + 238144 = 1222^2 + 488^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1731397 and 1731406.

It is not an unprimeable number, because it can be changed into a prime (1731421) by changing a digit.

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 as a sum of consecutive naturals, namely, 216425 + ... + 216432.

It is an arithmetic number, because the mean of its divisors is an integer number (505001).

2^1731428 is an apocalyptic number.

It is an amenable number.

1731428 is a deficient number, since it is larger than the sum of its proper divisors (1298578).

1731428 is a wasteful number, since it uses less digits than its factorization.

1731428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432861 (or 432859 counting only the distinct ones).

The product of its digits is 1344, while the sum is 26.

The square root of 1731428 is about 1315.8373759701. The cubic root of 1731428 is about 120.0792994370.

Adding to 1731428 its reverse (8241371), we get a palindrome (9972799).

The spelling of 1731428 in words is "one million, seven hundred thirty-one thousand, four hundred twenty-eight".