1686128356 has 12 divisors (see below), whose sum is σ = 3218972400. Its totient is φ = 766421960.

The previous prime is 1686128351. The next prime is 1686128383. The reversal of 1686128356 is 6538216861.

It is not an unprimeable number, because it can be changed into a prime (1686128351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19160506 + ... + 19160593.

It is an arithmetic number, because the mean of its divisors is an integer number (268247700).

Almost surely, 2^1686128356 is an apocalyptic number.

It is an amenable number.

1686128356 is a deficient number, since it is larger than the sum of its proper divisors (1532844044).

1686128356 is a wasteful number, since it uses less digits than its factorization.

1686128356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38321114 (or 38321112 counting only the distinct ones).

The product of its digits is 414720, while the sum is 46.

The square root of 1686128356 is about 41062.4932998472. The cubic root of 1686128356 is about 1190.2281312976.

The spelling of 1686128356 in words is "one billion, six hundred eighty-six million, one hundred twenty-eight thousand, three hundred fifty-six".