1680724 has 12 divisors (see below), whose sum is σ = 3042900. Its totient is φ = 811328.

The previous prime is 1680709. The next prime is 1680743. The reversal of 1680724 is 4270861.

It can be written as a sum of positive squares in 2 ways, for example, as 535824 + 1144900 = 732^2 + 1070^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1680692 and 1680701.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7129 + ... + 7360.

It is an arithmetic number, because the mean of its divisors is an integer number (253575).

2^1680724 is an apocalyptic number.

It is an amenable number.

1680724 is a deficient number, since it is larger than the sum of its proper divisors (1362176).

1680724 is a wasteful number, since it uses less digits than its factorization.

1680724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14522 (or 14520 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 1680724 is about 1296.4273986614. The cubic root of 1680724 is about 118.8955135848.

The spelling of 1680724 in words is "one million, six hundred eighty thousand, seven hundred twenty-four".