1724428 has 6 divisors (see below), whose sum is σ = 3017756. Its totient is φ = 862212.

The previous prime is 1724423. The next prime is 1724441. The reversal of 1724428 is 8244271.

It is a junction number, because it is equal to n+sod(n) for n = 1724396 and 1724405.

It is not an unprimeable number, because it can be changed into a prime (1724423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215550 + ... + 215557.

2^1724428 is an apocalyptic number.

It is an amenable number.

1724428 is a deficient number, since it is larger than the sum of its proper divisors (1293328).

1724428 is a wasteful number, since it uses less digits than its factorization.

1724428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431111 (or 431109 counting only the distinct ones).

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

The square root of 1724428 is about 1313.1747789232. The cubic root of 1724428 is about 119.9172577756.

Adding to 1724428 its reverse (8244271), we get a palindrome (9968699).

The spelling of 1724428 in words is "one million, seven hundred twenty-four thousand, four hundred twenty-eight".