1686374378 has 16 divisors (see below), whose sum is σ = 2725046016. Its totient is φ = 778068720.

The previous prime is 1686374377. The next prime is 1686374407. The reversal of 1686374378 is 8734736861.

It is not an unprimeable number, because it can be changed into a prime (1686374377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85475 + ... + 103337.

It is an arithmetic number, because the mean of its divisors is an integer number (170315376).

Almost surely, 2^1686374378 is an apocalyptic number.

1686374378 is a deficient number, since it is larger than the sum of its proper divisors (1038671638).

1686374378 is a wasteful number, since it uses less digits than its factorization.

1686374378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21509.

The product of its digits is 4064256, while the sum is 53.

The square root of 1686374378 is about 41065.4888927430. The cubic root of 1686374378 is about 1190.2860169786.

The spelling of 1686374378 in words is "one billion, six hundred eighty-six million, three hundred seventy-four thousand, three hundred seventy-eight".