1683863685 has 144 divisors (see below), whose sum is σ = 3721302000. Its totient is φ = 699052032.

The previous prime is 1683863681. The next prime is 1683863723. The reversal of 1683863685 is 5863683861.

It can be written as a sum of positive squares in 8 ways, for example, as 74529 + 1683789156 = 273^2 + 41034^2 .

It is not a de Polignac number, because 1683863685 - 2² = 1683863681 is a prime.

Its product of digits (4976640) is a multiple of the sum of its prime factors (1620).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1683863681) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 1086291 + ... + 1087839.

It is an arithmetic number, because the mean of its divisors is an integer number (25842375).

Almost surely, 2^1683863685 is an apocalyptic number.

1683863685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1683863685 is an abundant number, since it is smaller than the sum of its proper divisors (2037438315).

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

1683863685 is a wasteful number, since it uses less digits than its factorization.

1683863685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1620 (or 1610 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 54.

The square root of 1683863685 is about 41034.9081271056. The cubic root of 1683863685 is about 1189.6950198838.

The spelling of 1683863685 in words is "one billion, six hundred eighty-three million, eight hundred sixty-three thousand, six hundred eighty-five".