1684786645 has 4 divisors (see below), whose sum is σ = 2021743980. Its totient is φ = 1347829312.

The previous prime is 1684786603. The next prime is 1684786651. The reversal of 1684786645 is 5466874861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1217102769 + 467683876 = 34887^2 + 21626^2 .

It is a cyclic number.

It is not a de Polignac number, because 1684786645 - 2¹¹ = 1684784597 is a prime.

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, 168478660 + ... + 168478669.

It is an arithmetic number, because the mean of its divisors is an integer number (505435995).

Almost surely, 2^1684786645 is an apocalyptic number.

It is an amenable number.

1684786645 is a deficient number, since it is larger than the sum of its proper divisors (336957335).

1684786645 is an equidigital number, since it uses as much as digits as its factorization.

1684786645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336957334.

The product of its digits is 7741440, while the sum is 55.

The square root of 1684786645 is about 41046.1526211654. The cubic root of 1684786645 is about 1189.9123455432.

The spelling of 1684786645 in words is "one billion, six hundred eighty-four million, seven hundred eighty-six thousand, six hundred forty-five".