1684805085 has 24 divisors (see below), whose sum is σ = 3047301504. Its totient is φ = 859494240.

The previous prime is 1684805047. The next prime is 1684805117. The reversal of 1684805085 is 5805084861.

1684805085 is a `hidden beast` number, since 1 + 68 + 4 + 80 + 508 + 5 = 666.

It is not a de Polignac number, because 1684805085 - 2⁶ = 1684805021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1684805085.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 812881 + ... + 814950.

It is an arithmetic number, because the mean of its divisors is an integer number (126970896).

Almost surely, 2^1684805085 is an apocalyptic number.

1684805085 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1684805085 is a deficient number, since it is larger than the sum of its proper divisors (1362496419).

1684805085 is a wasteful number, since it uses less digits than its factorization.

1684805085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1627865 (or 1627862 counting only the distinct ones).

The product of its (nonzero) digits is 307200, while the sum is 45.

The square root of 1684805085 is about 41046.3772457448. The cubic root of 1684805085 is about 1189.9166867267.

The spelling of 1684805085 in words is "one billion, six hundred eighty-four million, eight hundred five thousand, eighty-five".