1685012378 has 64 divisors (see below), whose sum is σ = 3165388800. Its totient is φ = 656449920.

The previous prime is 1685012377. The next prime is 1685012387. The reversal of 1685012378 is 8732105861.

It is not an unprimeable number, because it can be changed into a prime (1685012377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1046438 + ... + 1048046.

It is an arithmetic number, because the mean of its divisors is an integer number (49459200).

Almost surely, 2^1685012378 is an apocalyptic number.

1685012378 is a deficient number, since it is larger than the sum of its proper divisors (1480376422).

1685012378 is a wasteful number, since it uses less digits than its factorization.

1685012378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1795.

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 1685012378 is about 41048.9022752132. The cubic root of 1685012378 is about 1189.9654858996.

The spelling of 1685012378 in words is "one billion, six hundred eighty-five million, twelve thousand, three hundred seventy-eight".