1985019850 has 48 divisors (see below), whose sum is σ = 4038375456. Its totient is φ = 719928000.

The previous prime is 1985019833. The next prime is 1985019859. The reversal of 1985019850 is 589105891.

It is a self number, because there is not a number n which added to its sum of digits gives 1985019850.

It is not an unprimeable number, because it can be changed into a prime (1985019859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 213805 + ... + 222895.

It is an arithmetic number, because the mean of its divisors is an integer number (84132822).

Almost surely, 2^1985019850 is an apocalyptic number.

1985019850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1985019850 is an abundant number, since it is smaller than the sum of its proper divisors (2053355606).

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

1985019850 is a wasteful number, since it uses less digits than its factorization.

1985019850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9511 (or 9506 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 46.

The square root of 1985019850 is about 44553.5615860281. The cubic root of 1985019850 is about 1256.7675289853.

The spelling of 1985019850 in words is "one billion, nine hundred eighty-five million, nineteen thousand, eight hundred fifty".