1728436 has 24 divisors (see below), whose sum is σ = 3193344. Its totient is φ = 817440.

The previous prime is 1728409. The next prime is 1728439. The reversal of 1728436 is 6348271.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a junction number, because it is equal to n+sod(n) for n = 1728398 and 1728407.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6441 + ... + 6703.

It is an arithmetic number, because the mean of its divisors is an integer number (133056).

2^1728436 is an apocalyptic number.

It is an amenable number.

1728436 is a deficient number, since it is larger than the sum of its proper divisors (1464908).

1728436 is a wasteful number, since it uses less digits than its factorization.

1728436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351 (or 349 counting only the distinct ones).

The product of its digits is 8064, while the sum is 31.

The square root of 1728436 is about 1314.6999657717. The cubic root of 1728436 is about 120.0100917439.

The spelling of 1728436 in words is "one million, seven hundred twenty-eight thousand, four hundred thirty-six".