1684684530 has 192 divisors, whose sum is σ = 4914898560. Its totient is φ = 398297088.

The previous prime is 1684684523. The next prime is 1684684531. The reversal of 1684684530 is 354864861.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1684684531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1907469 + ... + 1908351.

It is an arithmetic number, because the mean of its divisors is an integer number (25598430).

Almost surely, 2^1684684530 is an apocalyptic number.

1684684530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1684684530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2457449280).

1684684530 is an abundant number, since it is smaller than the sum of its proper divisors (3230214030).

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

1684684530 is a wasteful number, since it uses less digits than its factorization.

1684684530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 985 (or 982 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 45.

The square root of 1684684530 is about 41044.9086976692. The cubic root of 1684684530 is about 1189.8883048426. Note that the first 3 decimals are identical.

The spelling of 1684684530 in words is "one billion, six hundred eighty-four million, six hundred eighty-four thousand, five hundred thirty".