1686917386 has 32 divisors (see below), whose sum is σ = 3180862080. Its totient is φ = 657233280.

The previous prime is 1686917371. The next prime is 1686917387. The reversal of 1686917386 is 6837196861.

It is a super-3 number, since 3×1686917386³ (a number of 29 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1686917387) 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 15 ways as a sum of consecutive naturals, for example, 26631 + ... + 63898.

It is an arithmetic number, because the mean of its divisors is an integer number (99401940).

Almost surely, 2^1686917386 is an apocalyptic number.

1686917386 is a deficient number, since it is larger than the sum of its proper divisors (1493944694).

1686917386 is an equidigital number, since it uses as much as digits as its factorization.

1686917386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90571 (or 90549 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 55.

The square root of 1686917386 is about 41072.0998489242. The cubic root of 1686917386 is about 1190.4137595641.

The spelling of 1686917386 in words is "one billion, six hundred eighty-six million, nine hundred seventeen thousand, three hundred eighty-six".