1684911645 has 64 divisors (see below), whose sum is σ = 3069792000. Its totient is φ = 876572928.

The previous prime is 1684911643. The next prime is 1684911649. The reversal of 1684911645 is 5461194861.

It is not a de Polignac number, because 1684911645 - 2¹ = 1684911643 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 1684911645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1684911643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 985051 + ... + 986759.

It is an arithmetic number, because the mean of its divisors is an integer number (47965500).

Almost surely, 2^1684911645 is an apocalyptic number.

1684911645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1684911645 is a deficient number, since it is larger than the sum of its proper divisors (1384880355).

1684911645 is a wasteful number, since it uses less digits than its factorization.

1684911645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1899 (or 1893 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 1684911645 is about 41047.6752691307. The cubic root of 1684911645 is about 1189.9417726847.

The spelling of 1684911645 in words is "one billion, six hundred eighty-four million, nine hundred eleven thousand, six hundred forty-five".