1684040 has 16 divisors (see below), whose sum is σ = 3789180. Its totient is φ = 673600.

The previous prime is 1684031. The next prime is 1684063. The reversal of 1684040 is 404861.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1674436 + 9604 = 1294^2 + 98^2 .

It is a nialpdrome in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 1683997 and 1684015.

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, 21011 + ... + 21090.

2^1684040 is an apocalyptic number.

1684040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1684040 is an abundant number, since it is smaller than the sum of its proper divisors (2105140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1684040 is a wasteful number, since it uses less digits than its factorization.

1684040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42112 (or 42108 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 1684040 is about 1297.7056677074. The cubic root of 1684040 is about 118.9736542199.

The spelling of 1684040 in words is "one million, six hundred eighty-four thousand, forty".