1685185988 has 12 divisors (see below), whose sum is σ = 3077296320. Its totient is φ = 805958472.

The previous prime is 1685185973. The next prime is 1685185991. The reversal of 1685185988 is 8895815861.

It is a super-2 number, since 2×1685185988² = 5679703628303072288, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9158528 + ... + 9158711.

It is an arithmetic number, because the mean of its divisors is an integer number (256441360).

Almost surely, 2^1685185988 is an apocalyptic number.

It is an amenable number.

1685185988 is a deficient number, since it is larger than the sum of its proper divisors (1392110332).

1685185988 is a wasteful number, since it uses less digits than its factorization.

1685185988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18317266 (or 18317264 counting only the distinct ones).

The product of its digits is 5529600, while the sum is 59.

The square root of 1685185988 is about 41051.0168936167. The cubic root of 1685185988 is about 1190.0063526248.

The spelling of 1685185988 in words is "one billion, six hundred eighty-five million, one hundred eighty-five thousand, nine hundred eighty-eight".