1685384818 has 16 divisors (see below), whose sum is σ = 2733851736. Its totient is φ = 774639360.

The previous prime is 1685384801. The next prime is 1685384819. The reversal of 1685384818 is 8184835861.

It can be written as a sum of positive squares in 4 ways, for example, as 991431169 + 693953649 = 31487^2 + 26343^2 .

It is not an unprimeable number, because it can be changed into a prime (1685384819) 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 7 ways as a sum of consecutive naturals, for example, 128221 + ... + 140752.

Almost surely, 2^1685384818 is an apocalyptic number.

1685384818 is a deficient number, since it is larger than the sum of its proper divisors (1048466918).

1685384818 is a wasteful number, since it uses less digits than its factorization.

1685384818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269229.

The product of its digits is 1474560, while the sum is 52.

The square root of 1685384818 is about 41053.4385648754. The cubic root of 1685384818 is about 1190.0531525349.

The spelling of 1685384818 in words is "one billion, six hundred eighty-five million, three hundred eighty-four thousand, eight hundred eighteen".