1684140 has 24 divisors (see below), whose sum is σ = 4715760. Its totient is φ = 449088.

The previous prime is 1684127. The next prime is 1684169. The reversal of 1684140 is 414861.

It is a self number, because there is not a number n which added to its sum of digits gives 1684140.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13975 + ... + 14094.

It is an arithmetic number, because the mean of its divisors is an integer number (196490).

2^1684140 is an apocalyptic number.

1684140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1684140 is an abundant number, since it is smaller than the sum of its proper divisors (3031620).

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

1684140 is a wasteful number, since it uses less digits than its factorization.

1684140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28081 (or 28079 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 1684140 is about 1297.7441966736. The cubic root of 1684140 is about 118.9760090986.

The spelling of 1684140 in words is "one million, six hundred eighty-four thousand, one hundred forty".