1686543392 has 12 divisors (see below), whose sum is σ = 3320382366. Its totient is φ = 843271680.

The previous prime is 1686543389. The next prime is 1686543403. The reversal of 1686543392 is 2933456861.

It can be written as a sum of positive squares in only one way, i.e., 1018631056 + 667912336 = 31916^2 + 25844^2 .

It is a super-2 number, since 2×1686543392² = 5688857226197731328, which contains 22 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 26352209 + ... + 26352272.

Almost surely, 2^1686543392 is an apocalyptic number.

It is an amenable number.

1686543392 is a deficient number, since it is larger than the sum of its proper divisors (1633838974).

1686543392 is an equidigital number, since it uses as much as digits as its factorization.

1686543392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52704491 (or 52704483 counting only the distinct ones).

The product of its digits is 933120, while the sum is 47.

The square root of 1686543392 is about 41067.5467005274. The cubic root of 1686543392 is about 1190.3257804465.

The spelling of 1686543392 in words is "one billion, six hundred eighty-six million, five hundred forty-three thousand, three hundred ninety-two".