3985129650 has 48 divisors (see below), whose sum is σ = 9893661408. Its totient is φ = 1061568000.

The previous prime is 3985129633. The next prime is 3985129693. The reversal of 3985129650 is 569215893.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3985129650.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 131970 + ... + 159330.

It is an arithmetic number, because the mean of its divisors is an integer number (206117946).

Almost surely, 2^3985129650 is an apocalyptic number.

3985129650 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

3985129650 is an abundant number, since it is smaller than the sum of its proper divisors (5908531758).

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

3985129650 is a wasteful number, since it uses less digits than its factorization.

3985129650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28347 (or 28342 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 48.

The square root of 3985129650 is about 63127.8833004877. The cubic root of 3985129650 is about 1585.4315085287.

The spelling of 3985129650 in words is "three billion, nine hundred eighty-five million, one hundred twenty-nine thousand, six hundred fifty".