1671728 has 20 divisors (see below), whose sum is σ = 3263928. Its totient is φ = 829440.

The previous prime is 1671727. The next prime is 1671731. The reversal of 1671728 is 8271761.

It is a junction number, because it is equal to n+sod(n) for n = 1671694 and 1671703.

It is not an unprimeable number, because it can be changed into a prime (1671727) 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 in 3 ways as a sum of consecutive naturals, for example, 2288 + ... + 2928.

2^1671728 is an apocalyptic number.

It is an amenable number.

1671728 is a deficient number, since it is larger than the sum of its proper divisors (1592200).

1671728 is a wasteful number, since it uses less digits than its factorization.

1671728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812 (or 806 counting only the distinct ones).

The product of its digits is 4704, while the sum is 32.

The square root of 1671728 is about 1292.9532087435. The cubic root of 1671728 is about 118.6830063488.

The spelling of 1671728 in words is "one million, six hundred seventy-one thousand, seven hundred twenty-eight".