1684643900 has 36 divisors (see below), whose sum is σ = 3870721008. Its totient is φ = 634218240.

The previous prime is 1684643899. The next prime is 1684643903. The reversal of 1684643900 is 93464861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1684643903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 493784 + ... + 497183.

It is an arithmetic number, because the mean of its divisors is an integer number (107520028).

Almost surely, 2^1684643900 is an apocalyptic number.

1684643900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1684643900 is an abundant number, since it is smaller than the sum of its proper divisors (2186077108).

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

1684643900 is a wasteful number, since it uses less digits than its factorization.

1684643900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990998 (or 990991 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 1684643900 is about 41044.4137490110. The cubic root of 1684643900 is about 1189.8787391446.

The spelling of 1684643900 in words is "one billion, six hundred eighty-four million, six hundred forty-three thousand, nine hundred".