1985019849 has 12 divisors (see below), whose sum is σ = 2914255812. Its totient is φ = 1301652000.

The previous prime is 1985019833. The next prime is 1985019859. The reversal of 1985019849 is 9489105891.

1985019849 is a `hidden beast` number, since 1 + 9 + 8 + 501 + 98 + 49 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 541399824 + 1443620025 = 23268^2 + 37995^2 .

It is not a de Polignac number, because 1985019849 - 2⁴ = 1985019833 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1985019795 and 1985019804.

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 11 ways as a sum of consecutive naturals, for example, 1807302 + ... + 1808399.

It is an arithmetic number, because the mean of its divisors is an integer number (242854651).

Almost surely, 2^1985019849 is an apocalyptic number.

It is an amenable number.

1985019849 is a deficient number, since it is larger than the sum of its proper divisors (929235963).

1985019849 is a wasteful number, since it uses less digits than its factorization.

1985019849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3615768 (or 3615765 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 54.

The square root of 1985019849 is about 44553.5615748057. The cubic root of 1985019849 is about 1256.7675287743.

The spelling of 1985019849 in words is "one billion, nine hundred eighty-five million, nineteen thousand, eight hundred forty-nine".