3985901956 has 9 divisors (see below), whose sum is σ = 6975549399. Its totient is φ = 1992887844.

The previous prime is 3985901951. The next prime is 3985901963. The reversal of 3985901956 is 6591095893.

The square root of 3985901956 is 63134.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3985901897 and 3985901906.

It is not an unprimeable number, because it can be changed into a prime (3985901951) by changing a digit.

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 2 ways as a sum of consecutive naturals, for example, 110485 + ... + 142051.

Almost surely, 2^3985901956 is an apocalyptic number.

3985901956 is the 63134-th square number.

It is an amenable number.

3985901956 is a deficient number, since it is larger than the sum of its proper divisors (2989647443).

3985901956 is an frugal number, since it uses more digits than its factorization.

3985901956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63138 (or 31569 counting only the distinct ones).

The product of its (nonzero) digits is 2624400, while the sum is 55.

The cubic root of 3985901956 is about 1585.5339191807.

The spelling of 3985901956 in words is "three billion, nine hundred eighty-five million, nine hundred one thousand, nine hundred fifty-six".