1684861040 has 20 divisors (see below), whose sum is σ = 3917302104. Its totient is φ = 673944384.

The previous prime is 1684861033. The next prime is 1684861049. The reversal of 1684861040 is 401684861.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1684860985 and 1684861003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1684861049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10530302 + ... + 10530461.

Almost surely, 2^1684861040 is an apocalyptic number.

1684861040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1684861040 is an abundant number, since it is smaller than the sum of its proper divisors (2232441064).

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

1684861040 is a wasteful number, since it uses less digits than its factorization.

1684861040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21060776 (or 21060770 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 38.

The square root of 1684861040 is about 41047.0588471330. The cubic root of 1684861040 is about 1189.9298595761.

The spelling of 1684861040 in words is "one billion, six hundred eighty-four million, eight hundred sixty-one thousand, forty".