1684215640 has 16 divisors (see below), whose sum is σ = 3789485280. Its totient is φ = 673686240.

The previous prime is 1684215623. The next prime is 1684215697. The reversal of 1684215640 is 465124861.

It is a self number, because there is not a number n which added to its sum of digits gives 1684215640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21052656 + ... + 21052735.

It is an arithmetic number, because the mean of its divisors is an integer number (236842830).

Almost surely, 2^1684215640 is an apocalyptic number.

1684215640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1684215640 is an abundant number, since it is smaller than the sum of its proper divisors (2105269640).

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

1684215640 is a wasteful number, since it uses less digits than its factorization.

1684215640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42105402 (or 42105398 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 1684215640 is about 41039.1963858943. The cubic root of 1684215640 is about 1189.7779026700. Note that the first 3 decimals are identical.

The spelling of 1684215640 in words is "one billion, six hundred eighty-four million, two hundred fifteen thousand, six hundred forty".