1985963652 has 36 divisors (see below), whose sum is σ = 5023356156. Its totient is φ = 661555200.

The previous prime is 1985963621. The next prime is 1985963671. The reversal of 1985963652 is 2563695891.

It is a happy number.

1985963652 is a `hidden beast` number, since 19 + 8 + 596 + 36 + 5 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1754436996 + 231526656 = 41886^2 + 15216^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40408 + ... + 74864.

It is an arithmetic number, because the mean of its divisors is an integer number (139537671).

Almost surely, 2^1985963652 is an apocalyptic number.

1985963652 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1985963652 is an abundant number, since it is smaller than the sum of its proper divisors (3037392504).

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

1985963652 is a wasteful number, since it uses less digits than its factorization.

1985963652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36068 (or 36063 counting only the distinct ones).

The product of its digits is 3499200, while the sum is 54.

The square root of 1985963652 is about 44564.1520956026. The cubic root of 1985963652 is about 1256.9666792640.

The spelling of 1985963652 in words is "one billion, nine hundred eighty-five million, nine hundred sixty-three thousand, six hundred fifty-two".