1684870920 has 96 divisors (see below), whose sum is σ = 5545238400. Its totient is φ = 443604096.

The previous prime is 1684870877. The next prime is 1684870921. The reversal of 1684870920 is 290784861.

1684870920 is a `hidden beast` number, since 168 + 487 + 0 + 9 + 2 + 0 = 666.

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 (1684870921) 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 23 ways as a sum of consecutive naturals, for example, 1182 + ... + 58061.

It is an arithmetic number, because the mean of its divisors is an integer number (57762900).

Almost surely, 2^1684870920 is an apocalyptic number.

1684870920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1684870920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2772619200).

1684870920 is an abundant number, since it is smaller than the sum of its proper divisors (3860367480).

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

1684870920 is a wasteful number, since it uses less digits than its factorization.

1684870920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59339 (or 59332 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 1684870920 is about 41047.1791966269. The cubic root of 1684870920 is about 1189.9321854819.

The spelling of 1684870920 in words is "one billion, six hundred eighty-four million, eight hundred seventy thousand, nine hundred twenty".