1985109868 has 12 divisors (see below), whose sum is σ = 3970219792. Its totient is φ = 850761360.

The previous prime is 1985109851. The next prime is 1985109869. The reversal of 1985109868 is 8689015891.

1985109868 is an admirable number.

It is a super-2 number, since 2×1985109868² = 7881322376061954848, which contains 22 as substring.

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1985109869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35448363 + ... + 35448418.

Almost surely, 2^1985109868 is an apocalyptic number.

It is an amenable number.

1985109868 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1985109868 is a wasteful number, since it uses less digits than its factorization.

1985109868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70896792 (or 70896790 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 55.

The square root of 1985109868 is about 44554.5717968426. The cubic root of 1985109868 is about 1256.7865262747.

The spelling of 1985109868 in words is "one billion, nine hundred eighty-five million, one hundred nine thousand, eight hundred sixty-eight".