1985085687 has 16 divisors (see below), whose sum is σ = 2851561440. Its totient is φ = 1221084672.

The previous prime is 1985085677. The next prime is 1985085719. The reversal of 1985085687 is 7865805891.

It is a happy number.

It is not a de Polignac number, because 1985085687 - 2⁶ = 1985085623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985085617) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99139 + ... + 117467.

It is an arithmetic number, because the mean of its divisors is an integer number (178222590).

Almost surely, 2^1985085687 is an apocalyptic number.

1985085687 is a deficient number, since it is larger than the sum of its proper divisors (866475753).

1985085687 is a wasteful number, since it uses less digits than its factorization.

1985085687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21122.

The product of its (nonzero) digits is 4838400, while the sum is 57.

The square root of 1985085687 is about 44554.3004321693. The cubic root of 1985085687 is about 1256.7814232022.

The spelling of 1985085687 in words is "one billion, nine hundred eighty-five million, eighty-five thousand, six hundred eighty-seven".