684518146 has 16 divisors (see below), whose sum is σ = 1143891000. Its totient is φ = 305036928.

The previous prime is 684518143. The next prime is 684518221. The reversal of 684518146 is 641815486.

It can be written as a sum of positive squares in 4 ways, for example, as 317374225 + 367143921 = 17815^2 + 19161^2 .

It is not an unprimeable number, because it can be changed into a prime (684518143) 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, 453171 + ... + 454678.

Almost surely, 2^684518146 is an apocalyptic number.

684518146 is a deficient number, since it is larger than the sum of its proper divisors (459372854).

684518146 is a wasteful number, since it uses less digits than its factorization.

684518146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 907893.

The product of its digits is 184320, while the sum is 43.

The square root of 684518146 is about 26163.2976897026. The cubic root of 684518146 is about 881.3092366264.

The spelling of 684518146 in words is "six hundred eighty-four million, five hundred eighteen thousand, one hundred forty-six".